1 /* 2 * originally based on the dummy device. 3 * 4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov. 5 * Licensed under the GPL. Based on dummy.c, and eql.c devices. 6 * 7 * bonding.c: an Ethernet Bonding driver 8 * 9 * This is useful to talk to a Cisco EtherChannel compatible equipment: 10 * Cisco 5500 11 * Sun Trunking (Solaris) 12 * Alteon AceDirector Trunks 13 * Linux Bonding 14 * and probably many L2 switches ... 15 * 16 * How it works: 17 * ifconfig bond0 ipaddress netmask up 18 * will setup a network device, with an ip address. No mac address 19 * will be assigned at this time. The hw mac address will come from 20 * the first slave bonded to the channel. All slaves will then use 21 * this hw mac address. 22 * 23 * ifconfig bond0 down 24 * will release all slaves, marking them as down. 25 * 26 * ifenslave bond0 eth0 27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either 28 * a: be used as initial mac address 29 * b: if a hw mac address already is there, eth0's hw mac address 30 * will then be set from bond0. 31 * 32 */ 33 34 #include <linux/kernel.h> 35 #include <linux/module.h> 36 #include <linux/types.h> 37 #include <linux/fcntl.h> 38 #include <linux/interrupt.h> 39 #include <linux/ptrace.h> 40 #include <linux/ioport.h> 41 #include <linux/in.h> 42 #include <net/ip.h> 43 #include <linux/ip.h> 44 #include <linux/tcp.h> 45 #include <linux/udp.h> 46 #include <linux/slab.h> 47 #include <linux/string.h> 48 #include <linux/init.h> 49 #include <linux/timer.h> 50 #include <linux/socket.h> 51 #include <linux/ctype.h> 52 #include <linux/inet.h> 53 #include <linux/bitops.h> 54 #include <linux/io.h> 55 #include <asm/dma.h> 56 #include <linux/uaccess.h> 57 #include <linux/errno.h> 58 #include <linux/netdevice.h> 59 #include <linux/inetdevice.h> 60 #include <linux/igmp.h> 61 #include <linux/etherdevice.h> 62 #include <linux/skbuff.h> 63 #include <net/sock.h> 64 #include <linux/rtnetlink.h> 65 #include <linux/smp.h> 66 #include <linux/if_ether.h> 67 #include <net/arp.h> 68 #include <linux/mii.h> 69 #include <linux/ethtool.h> 70 #include <linux/if_vlan.h> 71 #include <linux/if_bonding.h> 72 #include <linux/jiffies.h> 73 #include <linux/preempt.h> 74 #include <net/route.h> 75 #include <net/net_namespace.h> 76 #include <net/netns/generic.h> 77 #include <net/pkt_sched.h> 78 #include <linux/rculist.h> 79 #include <net/flow_dissector.h> 80 #include <net/switchdev.h> 81 #include <net/bonding.h> 82 #include <net/bond_3ad.h> 83 #include <net/bond_alb.h> 84 85 #include "bonding_priv.h" 86 87 /*---------------------------- Module parameters ----------------------------*/ 88 89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */ 90 91 static int max_bonds = BOND_DEFAULT_MAX_BONDS; 92 static int tx_queues = BOND_DEFAULT_TX_QUEUES; 93 static int num_peer_notif = 1; 94 static int miimon; 95 static int updelay; 96 static int downdelay; 97 static int use_carrier = 1; 98 static char *mode; 99 static char *primary; 100 static char *primary_reselect; 101 static char *lacp_rate; 102 static int min_links; 103 static char *ad_select; 104 static char *xmit_hash_policy; 105 static int arp_interval; 106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 107 static char *arp_validate; 108 static char *arp_all_targets; 109 static char *fail_over_mac; 110 static int all_slaves_active; 111 static struct bond_params bonding_defaults; 112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 113 static int packets_per_slave = 1; 114 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 115 116 module_param(max_bonds, int, 0); 117 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 118 module_param(tx_queues, int, 0); 119 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 120 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 121 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 122 "failover event (alias of num_unsol_na)"); 123 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 124 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 125 "failover event (alias of num_grat_arp)"); 126 module_param(miimon, int, 0); 127 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 128 module_param(updelay, int, 0); 129 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 130 module_param(downdelay, int, 0); 131 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 132 "in milliseconds"); 133 module_param(use_carrier, int, 0); 134 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 135 "0 for off, 1 for on (default)"); 136 module_param(mode, charp, 0); 137 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 138 "1 for active-backup, 2 for balance-xor, " 139 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 140 "6 for balance-alb"); 141 module_param(primary, charp, 0); 142 MODULE_PARM_DESC(primary, "Primary network device to use"); 143 module_param(primary_reselect, charp, 0); 144 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 145 "once it comes up; " 146 "0 for always (default), " 147 "1 for only if speed of primary is " 148 "better, " 149 "2 for only on active slave " 150 "failure"); 151 module_param(lacp_rate, charp, 0); 152 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 153 "0 for slow, 1 for fast"); 154 module_param(ad_select, charp, 0); 155 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; " 156 "0 for stable (default), 1 for bandwidth, " 157 "2 for count"); 158 module_param(min_links, int, 0); 159 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); 160 161 module_param(xmit_hash_policy, charp, 0); 162 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; " 163 "0 for layer 2 (default), 1 for layer 3+4, " 164 "2 for layer 2+3, 3 for encap layer 2+3, " 165 "4 for encap layer 3+4"); 166 module_param(arp_interval, int, 0); 167 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 168 module_param_array(arp_ip_target, charp, NULL, 0); 169 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 170 module_param(arp_validate, charp, 0); 171 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 172 "0 for none (default), 1 for active, " 173 "2 for backup, 3 for all"); 174 module_param(arp_all_targets, charp, 0); 175 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all"); 176 module_param(fail_over_mac, charp, 0); 177 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 178 "the same MAC; 0 for none (default), " 179 "1 for active, 2 for follow"); 180 module_param(all_slaves_active, int, 0); 181 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface " 182 "by setting active flag for all slaves; " 183 "0 for never (default), 1 for always."); 184 module_param(resend_igmp, int, 0); 185 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 186 "link failure"); 187 module_param(packets_per_slave, int, 0); 188 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr " 189 "mode; 0 for a random slave, 1 packet per " 190 "slave (default), >1 packets per slave."); 191 module_param(lp_interval, uint, 0); 192 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where " 193 "the bonding driver sends learning packets to " 194 "each slaves peer switch. The default is 1."); 195 196 /*----------------------------- Global variables ----------------------------*/ 197 198 #ifdef CONFIG_NET_POLL_CONTROLLER 199 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 200 #endif 201 202 int bond_net_id __read_mostly; 203 204 static __be32 arp_target[BOND_MAX_ARP_TARGETS]; 205 static int arp_ip_count; 206 static int bond_mode = BOND_MODE_ROUNDROBIN; 207 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 208 static int lacp_fast; 209 210 /*-------------------------- Forward declarations ---------------------------*/ 211 212 static int bond_init(struct net_device *bond_dev); 213 static void bond_uninit(struct net_device *bond_dev); 214 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 215 struct rtnl_link_stats64 *stats); 216 static void bond_slave_arr_handler(struct work_struct *work); 217 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 218 int mod); 219 220 /*---------------------------- General routines -----------------------------*/ 221 222 const char *bond_mode_name(int mode) 223 { 224 static const char *names[] = { 225 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 226 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 227 [BOND_MODE_XOR] = "load balancing (xor)", 228 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 229 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 230 [BOND_MODE_TLB] = "transmit load balancing", 231 [BOND_MODE_ALB] = "adaptive load balancing", 232 }; 233 234 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) 235 return "unknown"; 236 237 return names[mode]; 238 } 239 240 /*---------------------------------- VLAN -----------------------------------*/ 241 242 /** 243 * bond_dev_queue_xmit - Prepare skb for xmit. 244 * 245 * @bond: bond device that got this skb for tx. 246 * @skb: hw accel VLAN tagged skb to transmit 247 * @slave_dev: slave that is supposed to xmit this skbuff 248 */ 249 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 250 struct net_device *slave_dev) 251 { 252 skb->dev = slave_dev; 253 254 BUILD_BUG_ON(sizeof(skb->queue_mapping) != 255 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); 256 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping; 257 258 if (unlikely(netpoll_tx_running(bond->dev))) 259 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 260 else 261 dev_queue_xmit(skb); 262 } 263 264 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 265 * We don't protect the slave list iteration with a lock because: 266 * a. This operation is performed in IOCTL context, 267 * b. The operation is protected by the RTNL semaphore in the 8021q code, 268 * c. Holding a lock with BH disabled while directly calling a base driver 269 * entry point is generally a BAD idea. 270 * 271 * The design of synchronization/protection for this operation in the 8021q 272 * module is good for one or more VLAN devices over a single physical device 273 * and cannot be extended for a teaming solution like bonding, so there is a 274 * potential race condition here where a net device from the vlan group might 275 * be referenced (either by a base driver or the 8021q code) while it is being 276 * removed from the system. However, it turns out we're not making matters 277 * worse, and if it works for regular VLAN usage it will work here too. 278 */ 279 280 /** 281 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 282 * @bond_dev: bonding net device that got called 283 * @vid: vlan id being added 284 */ 285 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, 286 __be16 proto, u16 vid) 287 { 288 struct bonding *bond = netdev_priv(bond_dev); 289 struct slave *slave, *rollback_slave; 290 struct list_head *iter; 291 int res; 292 293 bond_for_each_slave(bond, slave, iter) { 294 res = vlan_vid_add(slave->dev, proto, vid); 295 if (res) 296 goto unwind; 297 } 298 299 return 0; 300 301 unwind: 302 /* unwind to the slave that failed */ 303 bond_for_each_slave(bond, rollback_slave, iter) { 304 if (rollback_slave == slave) 305 break; 306 307 vlan_vid_del(rollback_slave->dev, proto, vid); 308 } 309 310 return res; 311 } 312 313 /** 314 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 315 * @bond_dev: bonding net device that got called 316 * @vid: vlan id being removed 317 */ 318 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, 319 __be16 proto, u16 vid) 320 { 321 struct bonding *bond = netdev_priv(bond_dev); 322 struct list_head *iter; 323 struct slave *slave; 324 325 bond_for_each_slave(bond, slave, iter) 326 vlan_vid_del(slave->dev, proto, vid); 327 328 if (bond_is_lb(bond)) 329 bond_alb_clear_vlan(bond, vid); 330 331 return 0; 332 } 333 334 /*------------------------------- Link status -------------------------------*/ 335 336 /* Set the carrier state for the master according to the state of its 337 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 338 * do special 802.3ad magic. 339 * 340 * Returns zero if carrier state does not change, nonzero if it does. 341 */ 342 int bond_set_carrier(struct bonding *bond) 343 { 344 struct list_head *iter; 345 struct slave *slave; 346 347 if (!bond_has_slaves(bond)) 348 goto down; 349 350 if (BOND_MODE(bond) == BOND_MODE_8023AD) 351 return bond_3ad_set_carrier(bond); 352 353 bond_for_each_slave(bond, slave, iter) { 354 if (slave->link == BOND_LINK_UP) { 355 if (!netif_carrier_ok(bond->dev)) { 356 netif_carrier_on(bond->dev); 357 return 1; 358 } 359 return 0; 360 } 361 } 362 363 down: 364 if (netif_carrier_ok(bond->dev)) { 365 netif_carrier_off(bond->dev); 366 return 1; 367 } 368 return 0; 369 } 370 371 /* Get link speed and duplex from the slave's base driver 372 * using ethtool. If for some reason the call fails or the 373 * values are invalid, set speed and duplex to -1, 374 * and return. 375 */ 376 static void bond_update_speed_duplex(struct slave *slave) 377 { 378 struct net_device *slave_dev = slave->dev; 379 struct ethtool_link_ksettings ecmd; 380 int res; 381 382 slave->speed = SPEED_UNKNOWN; 383 slave->duplex = DUPLEX_UNKNOWN; 384 385 res = __ethtool_get_link_ksettings(slave_dev, &ecmd); 386 if (res < 0) 387 return; 388 389 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) 390 return; 391 392 switch (ecmd.base.duplex) { 393 case DUPLEX_FULL: 394 case DUPLEX_HALF: 395 break; 396 default: 397 return; 398 } 399 400 slave->speed = ecmd.base.speed; 401 slave->duplex = ecmd.base.duplex; 402 403 return; 404 } 405 406 const char *bond_slave_link_status(s8 link) 407 { 408 switch (link) { 409 case BOND_LINK_UP: 410 return "up"; 411 case BOND_LINK_FAIL: 412 return "going down"; 413 case BOND_LINK_DOWN: 414 return "down"; 415 case BOND_LINK_BACK: 416 return "going back"; 417 default: 418 return "unknown"; 419 } 420 } 421 422 /* if <dev> supports MII link status reporting, check its link status. 423 * 424 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 425 * depending upon the setting of the use_carrier parameter. 426 * 427 * Return either BMSR_LSTATUS, meaning that the link is up (or we 428 * can't tell and just pretend it is), or 0, meaning that the link is 429 * down. 430 * 431 * If reporting is non-zero, instead of faking link up, return -1 if 432 * both ETHTOOL and MII ioctls fail (meaning the device does not 433 * support them). If use_carrier is set, return whatever it says. 434 * It'd be nice if there was a good way to tell if a driver supports 435 * netif_carrier, but there really isn't. 436 */ 437 static int bond_check_dev_link(struct bonding *bond, 438 struct net_device *slave_dev, int reporting) 439 { 440 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 441 int (*ioctl)(struct net_device *, struct ifreq *, int); 442 struct ifreq ifr; 443 struct mii_ioctl_data *mii; 444 445 if (!reporting && !netif_running(slave_dev)) 446 return 0; 447 448 if (bond->params.use_carrier) 449 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 450 451 /* Try to get link status using Ethtool first. */ 452 if (slave_dev->ethtool_ops->get_link) 453 return slave_dev->ethtool_ops->get_link(slave_dev) ? 454 BMSR_LSTATUS : 0; 455 456 /* Ethtool can't be used, fallback to MII ioctls. */ 457 ioctl = slave_ops->ndo_do_ioctl; 458 if (ioctl) { 459 /* TODO: set pointer to correct ioctl on a per team member 460 * bases to make this more efficient. that is, once 461 * we determine the correct ioctl, we will always 462 * call it and not the others for that team 463 * member. 464 */ 465 466 /* We cannot assume that SIOCGMIIPHY will also read a 467 * register; not all network drivers (e.g., e100) 468 * support that. 469 */ 470 471 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 472 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 473 mii = if_mii(&ifr); 474 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 475 mii->reg_num = MII_BMSR; 476 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) 477 return mii->val_out & BMSR_LSTATUS; 478 } 479 } 480 481 /* If reporting, report that either there's no dev->do_ioctl, 482 * or both SIOCGMIIREG and get_link failed (meaning that we 483 * cannot report link status). If not reporting, pretend 484 * we're ok. 485 */ 486 return reporting ? -1 : BMSR_LSTATUS; 487 } 488 489 /*----------------------------- Multicast list ------------------------------*/ 490 491 /* Push the promiscuity flag down to appropriate slaves */ 492 static int bond_set_promiscuity(struct bonding *bond, int inc) 493 { 494 struct list_head *iter; 495 int err = 0; 496 497 if (bond_uses_primary(bond)) { 498 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 499 500 if (curr_active) 501 err = dev_set_promiscuity(curr_active->dev, inc); 502 } else { 503 struct slave *slave; 504 505 bond_for_each_slave(bond, slave, iter) { 506 err = dev_set_promiscuity(slave->dev, inc); 507 if (err) 508 return err; 509 } 510 } 511 return err; 512 } 513 514 /* Push the allmulti flag down to all slaves */ 515 static int bond_set_allmulti(struct bonding *bond, int inc) 516 { 517 struct list_head *iter; 518 int err = 0; 519 520 if (bond_uses_primary(bond)) { 521 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 522 523 if (curr_active) 524 err = dev_set_allmulti(curr_active->dev, inc); 525 } else { 526 struct slave *slave; 527 528 bond_for_each_slave(bond, slave, iter) { 529 err = dev_set_allmulti(slave->dev, inc); 530 if (err) 531 return err; 532 } 533 } 534 return err; 535 } 536 537 /* Retrieve the list of registered multicast addresses for the bonding 538 * device and retransmit an IGMP JOIN request to the current active 539 * slave. 540 */ 541 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 542 { 543 struct bonding *bond = container_of(work, struct bonding, 544 mcast_work.work); 545 546 if (!rtnl_trylock()) { 547 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 548 return; 549 } 550 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 551 552 if (bond->igmp_retrans > 1) { 553 bond->igmp_retrans--; 554 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 555 } 556 rtnl_unlock(); 557 } 558 559 /* Flush bond's hardware addresses from slave */ 560 static void bond_hw_addr_flush(struct net_device *bond_dev, 561 struct net_device *slave_dev) 562 { 563 struct bonding *bond = netdev_priv(bond_dev); 564 565 dev_uc_unsync(slave_dev, bond_dev); 566 dev_mc_unsync(slave_dev, bond_dev); 567 568 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 569 /* del lacpdu mc addr from mc list */ 570 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 571 572 dev_mc_del(slave_dev, lacpdu_multicast); 573 } 574 } 575 576 /*--------------------------- Active slave change ---------------------------*/ 577 578 /* Update the hardware address list and promisc/allmulti for the new and 579 * old active slaves (if any). Modes that are not using primary keep all 580 * slaves up date at all times; only the modes that use primary need to call 581 * this function to swap these settings during a failover. 582 */ 583 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 584 struct slave *old_active) 585 { 586 if (old_active) { 587 if (bond->dev->flags & IFF_PROMISC) 588 dev_set_promiscuity(old_active->dev, -1); 589 590 if (bond->dev->flags & IFF_ALLMULTI) 591 dev_set_allmulti(old_active->dev, -1); 592 593 bond_hw_addr_flush(bond->dev, old_active->dev); 594 } 595 596 if (new_active) { 597 /* FIXME: Signal errors upstream. */ 598 if (bond->dev->flags & IFF_PROMISC) 599 dev_set_promiscuity(new_active->dev, 1); 600 601 if (bond->dev->flags & IFF_ALLMULTI) 602 dev_set_allmulti(new_active->dev, 1); 603 604 netif_addr_lock_bh(bond->dev); 605 dev_uc_sync(new_active->dev, bond->dev); 606 dev_mc_sync(new_active->dev, bond->dev); 607 netif_addr_unlock_bh(bond->dev); 608 } 609 } 610 611 /** 612 * bond_set_dev_addr - clone slave's address to bond 613 * @bond_dev: bond net device 614 * @slave_dev: slave net device 615 * 616 * Should be called with RTNL held. 617 */ 618 static void bond_set_dev_addr(struct net_device *bond_dev, 619 struct net_device *slave_dev) 620 { 621 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->name=%s slave_dev->addr_len=%d\n", 622 bond_dev, slave_dev, slave_dev->name, slave_dev->addr_len); 623 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); 624 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 625 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 626 } 627 628 static struct slave *bond_get_old_active(struct bonding *bond, 629 struct slave *new_active) 630 { 631 struct slave *slave; 632 struct list_head *iter; 633 634 bond_for_each_slave(bond, slave, iter) { 635 if (slave == new_active) 636 continue; 637 638 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 639 return slave; 640 } 641 642 return NULL; 643 } 644 645 /* bond_do_fail_over_mac 646 * 647 * Perform special MAC address swapping for fail_over_mac settings 648 * 649 * Called with RTNL 650 */ 651 static void bond_do_fail_over_mac(struct bonding *bond, 652 struct slave *new_active, 653 struct slave *old_active) 654 { 655 u8 tmp_mac[ETH_ALEN]; 656 struct sockaddr saddr; 657 int rv; 658 659 switch (bond->params.fail_over_mac) { 660 case BOND_FOM_ACTIVE: 661 if (new_active) 662 bond_set_dev_addr(bond->dev, new_active->dev); 663 break; 664 case BOND_FOM_FOLLOW: 665 /* if new_active && old_active, swap them 666 * if just old_active, do nothing (going to no active slave) 667 * if just new_active, set new_active to bond's MAC 668 */ 669 if (!new_active) 670 return; 671 672 if (!old_active) 673 old_active = bond_get_old_active(bond, new_active); 674 675 if (old_active) { 676 ether_addr_copy(tmp_mac, new_active->dev->dev_addr); 677 ether_addr_copy(saddr.sa_data, 678 old_active->dev->dev_addr); 679 saddr.sa_family = new_active->dev->type; 680 } else { 681 ether_addr_copy(saddr.sa_data, bond->dev->dev_addr); 682 saddr.sa_family = bond->dev->type; 683 } 684 685 rv = dev_set_mac_address(new_active->dev, &saddr); 686 if (rv) { 687 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 688 -rv, new_active->dev->name); 689 goto out; 690 } 691 692 if (!old_active) 693 goto out; 694 695 ether_addr_copy(saddr.sa_data, tmp_mac); 696 saddr.sa_family = old_active->dev->type; 697 698 rv = dev_set_mac_address(old_active->dev, &saddr); 699 if (rv) 700 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 701 -rv, new_active->dev->name); 702 out: 703 break; 704 default: 705 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 706 bond->params.fail_over_mac); 707 break; 708 } 709 710 } 711 712 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 713 { 714 struct slave *prim = rtnl_dereference(bond->primary_slave); 715 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 716 717 if (!prim || prim->link != BOND_LINK_UP) { 718 if (!curr || curr->link != BOND_LINK_UP) 719 return NULL; 720 return curr; 721 } 722 723 if (bond->force_primary) { 724 bond->force_primary = false; 725 return prim; 726 } 727 728 if (!curr || curr->link != BOND_LINK_UP) 729 return prim; 730 731 /* At this point, prim and curr are both up */ 732 switch (bond->params.primary_reselect) { 733 case BOND_PRI_RESELECT_ALWAYS: 734 return prim; 735 case BOND_PRI_RESELECT_BETTER: 736 if (prim->speed < curr->speed) 737 return curr; 738 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 739 return curr; 740 return prim; 741 case BOND_PRI_RESELECT_FAILURE: 742 return curr; 743 default: 744 netdev_err(bond->dev, "impossible primary_reselect %d\n", 745 bond->params.primary_reselect); 746 return curr; 747 } 748 } 749 750 /** 751 * bond_find_best_slave - select the best available slave to be the active one 752 * @bond: our bonding struct 753 */ 754 static struct slave *bond_find_best_slave(struct bonding *bond) 755 { 756 struct slave *slave, *bestslave = NULL; 757 struct list_head *iter; 758 int mintime = bond->params.updelay; 759 760 slave = bond_choose_primary_or_current(bond); 761 if (slave) 762 return slave; 763 764 bond_for_each_slave(bond, slave, iter) { 765 if (slave->link == BOND_LINK_UP) 766 return slave; 767 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 768 slave->delay < mintime) { 769 mintime = slave->delay; 770 bestslave = slave; 771 } 772 } 773 774 return bestslave; 775 } 776 777 static bool bond_should_notify_peers(struct bonding *bond) 778 { 779 struct slave *slave; 780 781 rcu_read_lock(); 782 slave = rcu_dereference(bond->curr_active_slave); 783 rcu_read_unlock(); 784 785 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 786 slave ? slave->dev->name : "NULL"); 787 788 if (!slave || !bond->send_peer_notif || 789 !netif_carrier_ok(bond->dev) || 790 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 791 return false; 792 793 return true; 794 } 795 796 /** 797 * change_active_interface - change the active slave into the specified one 798 * @bond: our bonding struct 799 * @new: the new slave to make the active one 800 * 801 * Set the new slave to the bond's settings and unset them on the old 802 * curr_active_slave. 803 * Setting include flags, mc-list, promiscuity, allmulti, etc. 804 * 805 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 806 * because it is apparently the best available slave we have, even though its 807 * updelay hasn't timed out yet. 808 * 809 * Caller must hold RTNL. 810 */ 811 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 812 { 813 struct slave *old_active; 814 815 ASSERT_RTNL(); 816 817 old_active = rtnl_dereference(bond->curr_active_slave); 818 819 if (old_active == new_active) 820 return; 821 822 if (new_active) { 823 new_active->last_link_up = jiffies; 824 825 if (new_active->link == BOND_LINK_BACK) { 826 if (bond_uses_primary(bond)) { 827 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n", 828 new_active->dev->name, 829 (bond->params.updelay - new_active->delay) * bond->params.miimon); 830 } 831 832 new_active->delay = 0; 833 bond_set_slave_link_state(new_active, BOND_LINK_UP, 834 BOND_SLAVE_NOTIFY_NOW); 835 836 if (BOND_MODE(bond) == BOND_MODE_8023AD) 837 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 838 839 if (bond_is_lb(bond)) 840 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 841 } else { 842 if (bond_uses_primary(bond)) { 843 netdev_info(bond->dev, "making interface %s the new active one\n", 844 new_active->dev->name); 845 } 846 } 847 } 848 849 if (bond_uses_primary(bond)) 850 bond_hw_addr_swap(bond, new_active, old_active); 851 852 if (bond_is_lb(bond)) { 853 bond_alb_handle_active_change(bond, new_active); 854 if (old_active) 855 bond_set_slave_inactive_flags(old_active, 856 BOND_SLAVE_NOTIFY_NOW); 857 if (new_active) 858 bond_set_slave_active_flags(new_active, 859 BOND_SLAVE_NOTIFY_NOW); 860 } else { 861 rcu_assign_pointer(bond->curr_active_slave, new_active); 862 } 863 864 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 865 if (old_active) 866 bond_set_slave_inactive_flags(old_active, 867 BOND_SLAVE_NOTIFY_NOW); 868 869 if (new_active) { 870 bool should_notify_peers = false; 871 872 bond_set_slave_active_flags(new_active, 873 BOND_SLAVE_NOTIFY_NOW); 874 875 if (bond->params.fail_over_mac) 876 bond_do_fail_over_mac(bond, new_active, 877 old_active); 878 879 if (netif_running(bond->dev)) { 880 bond->send_peer_notif = 881 bond->params.num_peer_notif; 882 should_notify_peers = 883 bond_should_notify_peers(bond); 884 } 885 886 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 887 if (should_notify_peers) 888 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 889 bond->dev); 890 } 891 } 892 893 /* resend IGMP joins since active slave has changed or 894 * all were sent on curr_active_slave. 895 * resend only if bond is brought up with the affected 896 * bonding modes and the retransmission is enabled 897 */ 898 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 899 ((bond_uses_primary(bond) && new_active) || 900 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 901 bond->igmp_retrans = bond->params.resend_igmp; 902 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 903 } 904 } 905 906 /** 907 * bond_select_active_slave - select a new active slave, if needed 908 * @bond: our bonding struct 909 * 910 * This functions should be called when one of the following occurs: 911 * - The old curr_active_slave has been released or lost its link. 912 * - The primary_slave has got its link back. 913 * - A slave has got its link back and there's no old curr_active_slave. 914 * 915 * Caller must hold RTNL. 916 */ 917 void bond_select_active_slave(struct bonding *bond) 918 { 919 struct slave *best_slave; 920 int rv; 921 922 ASSERT_RTNL(); 923 924 best_slave = bond_find_best_slave(bond); 925 if (best_slave != rtnl_dereference(bond->curr_active_slave)) { 926 bond_change_active_slave(bond, best_slave); 927 rv = bond_set_carrier(bond); 928 if (!rv) 929 return; 930 931 if (netif_carrier_ok(bond->dev)) 932 netdev_info(bond->dev, "first active interface up!\n"); 933 else 934 netdev_info(bond->dev, "now running without any active interface!\n"); 935 } 936 } 937 938 #ifdef CONFIG_NET_POLL_CONTROLLER 939 static inline int slave_enable_netpoll(struct slave *slave) 940 { 941 struct netpoll *np; 942 int err = 0; 943 944 np = kzalloc(sizeof(*np), GFP_KERNEL); 945 err = -ENOMEM; 946 if (!np) 947 goto out; 948 949 err = __netpoll_setup(np, slave->dev); 950 if (err) { 951 kfree(np); 952 goto out; 953 } 954 slave->np = np; 955 out: 956 return err; 957 } 958 static inline void slave_disable_netpoll(struct slave *slave) 959 { 960 struct netpoll *np = slave->np; 961 962 if (!np) 963 return; 964 965 slave->np = NULL; 966 __netpoll_free_async(np); 967 } 968 969 static void bond_poll_controller(struct net_device *bond_dev) 970 { 971 struct bonding *bond = netdev_priv(bond_dev); 972 struct slave *slave = NULL; 973 struct list_head *iter; 974 struct ad_info ad_info; 975 struct netpoll_info *ni; 976 const struct net_device_ops *ops; 977 978 if (BOND_MODE(bond) == BOND_MODE_8023AD) 979 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 980 return; 981 982 bond_for_each_slave_rcu(bond, slave, iter) { 983 ops = slave->dev->netdev_ops; 984 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller) 985 continue; 986 987 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 988 struct aggregator *agg = 989 SLAVE_AD_INFO(slave)->port.aggregator; 990 991 if (agg && 992 agg->aggregator_identifier != ad_info.aggregator_id) 993 continue; 994 } 995 996 ni = rcu_dereference_bh(slave->dev->npinfo); 997 if (down_trylock(&ni->dev_lock)) 998 continue; 999 ops->ndo_poll_controller(slave->dev); 1000 up(&ni->dev_lock); 1001 } 1002 } 1003 1004 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1005 { 1006 struct bonding *bond = netdev_priv(bond_dev); 1007 struct list_head *iter; 1008 struct slave *slave; 1009 1010 bond_for_each_slave(bond, slave, iter) 1011 if (bond_slave_is_up(slave)) 1012 slave_disable_netpoll(slave); 1013 } 1014 1015 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1016 { 1017 struct bonding *bond = netdev_priv(dev); 1018 struct list_head *iter; 1019 struct slave *slave; 1020 int err = 0; 1021 1022 bond_for_each_slave(bond, slave, iter) { 1023 err = slave_enable_netpoll(slave); 1024 if (err) { 1025 bond_netpoll_cleanup(dev); 1026 break; 1027 } 1028 } 1029 return err; 1030 } 1031 #else 1032 static inline int slave_enable_netpoll(struct slave *slave) 1033 { 1034 return 0; 1035 } 1036 static inline void slave_disable_netpoll(struct slave *slave) 1037 { 1038 } 1039 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1040 { 1041 } 1042 #endif 1043 1044 /*---------------------------------- IOCTL ----------------------------------*/ 1045 1046 static netdev_features_t bond_fix_features(struct net_device *dev, 1047 netdev_features_t features) 1048 { 1049 struct bonding *bond = netdev_priv(dev); 1050 struct list_head *iter; 1051 netdev_features_t mask; 1052 struct slave *slave; 1053 1054 mask = features; 1055 1056 features &= ~NETIF_F_ONE_FOR_ALL; 1057 features |= NETIF_F_ALL_FOR_ALL; 1058 1059 bond_for_each_slave(bond, slave, iter) { 1060 features = netdev_increment_features(features, 1061 slave->dev->features, 1062 mask); 1063 } 1064 features = netdev_add_tso_features(features, mask); 1065 1066 return features; 1067 } 1068 1069 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1070 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ 1071 NETIF_F_HIGHDMA | NETIF_F_LRO) 1072 1073 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1074 NETIF_F_RXCSUM | NETIF_F_ALL_TSO) 1075 1076 static void bond_compute_features(struct bonding *bond) 1077 { 1078 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1079 IFF_XMIT_DST_RELEASE_PERM; 1080 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1081 netdev_features_t enc_features = BOND_ENC_FEATURES; 1082 struct net_device *bond_dev = bond->dev; 1083 struct list_head *iter; 1084 struct slave *slave; 1085 unsigned short max_hard_header_len = ETH_HLEN; 1086 unsigned int gso_max_size = GSO_MAX_SIZE; 1087 u16 gso_max_segs = GSO_MAX_SEGS; 1088 1089 if (!bond_has_slaves(bond)) 1090 goto done; 1091 vlan_features &= NETIF_F_ALL_FOR_ALL; 1092 1093 bond_for_each_slave(bond, slave, iter) { 1094 vlan_features = netdev_increment_features(vlan_features, 1095 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1096 1097 enc_features = netdev_increment_features(enc_features, 1098 slave->dev->hw_enc_features, 1099 BOND_ENC_FEATURES); 1100 dst_release_flag &= slave->dev->priv_flags; 1101 if (slave->dev->hard_header_len > max_hard_header_len) 1102 max_hard_header_len = slave->dev->hard_header_len; 1103 1104 gso_max_size = min(gso_max_size, slave->dev->gso_max_size); 1105 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs); 1106 } 1107 1108 done: 1109 bond_dev->vlan_features = vlan_features; 1110 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL; 1111 bond_dev->hard_header_len = max_hard_header_len; 1112 bond_dev->gso_max_segs = gso_max_segs; 1113 netif_set_gso_max_size(bond_dev, gso_max_size); 1114 1115 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1116 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1117 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1118 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1119 1120 netdev_change_features(bond_dev); 1121 } 1122 1123 static void bond_setup_by_slave(struct net_device *bond_dev, 1124 struct net_device *slave_dev) 1125 { 1126 bond_dev->header_ops = slave_dev->header_ops; 1127 1128 bond_dev->type = slave_dev->type; 1129 bond_dev->hard_header_len = slave_dev->hard_header_len; 1130 bond_dev->addr_len = slave_dev->addr_len; 1131 1132 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1133 slave_dev->addr_len); 1134 } 1135 1136 /* On bonding slaves other than the currently active slave, suppress 1137 * duplicates except for alb non-mcast/bcast. 1138 */ 1139 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1140 struct slave *slave, 1141 struct bonding *bond) 1142 { 1143 if (bond_is_slave_inactive(slave)) { 1144 if (BOND_MODE(bond) == BOND_MODE_ALB && 1145 skb->pkt_type != PACKET_BROADCAST && 1146 skb->pkt_type != PACKET_MULTICAST) 1147 return false; 1148 return true; 1149 } 1150 return false; 1151 } 1152 1153 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1154 { 1155 struct sk_buff *skb = *pskb; 1156 struct slave *slave; 1157 struct bonding *bond; 1158 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1159 struct slave *); 1160 int ret = RX_HANDLER_ANOTHER; 1161 1162 skb = skb_share_check(skb, GFP_ATOMIC); 1163 if (unlikely(!skb)) 1164 return RX_HANDLER_CONSUMED; 1165 1166 *pskb = skb; 1167 1168 slave = bond_slave_get_rcu(skb->dev); 1169 bond = slave->bond; 1170 1171 recv_probe = ACCESS_ONCE(bond->recv_probe); 1172 if (recv_probe) { 1173 ret = recv_probe(skb, bond, slave); 1174 if (ret == RX_HANDLER_CONSUMED) { 1175 consume_skb(skb); 1176 return ret; 1177 } 1178 } 1179 1180 if (bond_should_deliver_exact_match(skb, slave, bond)) 1181 return RX_HANDLER_EXACT; 1182 1183 skb->dev = bond->dev; 1184 1185 if (BOND_MODE(bond) == BOND_MODE_ALB && 1186 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1187 skb->pkt_type == PACKET_HOST) { 1188 1189 if (unlikely(skb_cow_head(skb, 1190 skb->data - skb_mac_header(skb)))) { 1191 kfree_skb(skb); 1192 return RX_HANDLER_CONSUMED; 1193 } 1194 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr); 1195 } 1196 1197 return ret; 1198 } 1199 1200 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) 1201 { 1202 switch (BOND_MODE(bond)) { 1203 case BOND_MODE_ROUNDROBIN: 1204 return NETDEV_LAG_TX_TYPE_ROUNDROBIN; 1205 case BOND_MODE_ACTIVEBACKUP: 1206 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; 1207 case BOND_MODE_BROADCAST: 1208 return NETDEV_LAG_TX_TYPE_BROADCAST; 1209 case BOND_MODE_XOR: 1210 case BOND_MODE_8023AD: 1211 return NETDEV_LAG_TX_TYPE_HASH; 1212 default: 1213 return NETDEV_LAG_TX_TYPE_UNKNOWN; 1214 } 1215 } 1216 1217 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave) 1218 { 1219 struct netdev_lag_upper_info lag_upper_info; 1220 int err; 1221 1222 lag_upper_info.tx_type = bond_lag_tx_type(bond); 1223 err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave, 1224 &lag_upper_info); 1225 if (err) 1226 return err; 1227 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL); 1228 return 0; 1229 } 1230 1231 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) 1232 { 1233 netdev_upper_dev_unlink(slave->dev, bond->dev); 1234 slave->dev->flags &= ~IFF_SLAVE; 1235 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL); 1236 } 1237 1238 static struct slave *bond_alloc_slave(struct bonding *bond) 1239 { 1240 struct slave *slave = NULL; 1241 1242 slave = kzalloc(sizeof(*slave), GFP_KERNEL); 1243 if (!slave) 1244 return NULL; 1245 1246 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1247 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1248 GFP_KERNEL); 1249 if (!SLAVE_AD_INFO(slave)) { 1250 kfree(slave); 1251 return NULL; 1252 } 1253 } 1254 return slave; 1255 } 1256 1257 static void bond_free_slave(struct slave *slave) 1258 { 1259 struct bonding *bond = bond_get_bond_by_slave(slave); 1260 1261 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1262 kfree(SLAVE_AD_INFO(slave)); 1263 1264 kfree(slave); 1265 } 1266 1267 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1268 { 1269 info->bond_mode = BOND_MODE(bond); 1270 info->miimon = bond->params.miimon; 1271 info->num_slaves = bond->slave_cnt; 1272 } 1273 1274 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1275 { 1276 strcpy(info->slave_name, slave->dev->name); 1277 info->link = slave->link; 1278 info->state = bond_slave_state(slave); 1279 info->link_failure_count = slave->link_failure_count; 1280 } 1281 1282 static void bond_netdev_notify(struct net_device *dev, 1283 struct netdev_bonding_info *info) 1284 { 1285 rtnl_lock(); 1286 netdev_bonding_info_change(dev, info); 1287 rtnl_unlock(); 1288 } 1289 1290 static void bond_netdev_notify_work(struct work_struct *_work) 1291 { 1292 struct netdev_notify_work *w = 1293 container_of(_work, struct netdev_notify_work, work.work); 1294 1295 bond_netdev_notify(w->dev, &w->bonding_info); 1296 dev_put(w->dev); 1297 kfree(w); 1298 } 1299 1300 void bond_queue_slave_event(struct slave *slave) 1301 { 1302 struct bonding *bond = slave->bond; 1303 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC); 1304 1305 if (!nnw) 1306 return; 1307 1308 dev_hold(slave->dev); 1309 nnw->dev = slave->dev; 1310 bond_fill_ifslave(slave, &nnw->bonding_info.slave); 1311 bond_fill_ifbond(bond, &nnw->bonding_info.master); 1312 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work); 1313 1314 queue_delayed_work(slave->bond->wq, &nnw->work, 0); 1315 } 1316 1317 void bond_lower_state_changed(struct slave *slave) 1318 { 1319 struct netdev_lag_lower_state_info info; 1320 1321 info.link_up = slave->link == BOND_LINK_UP || 1322 slave->link == BOND_LINK_FAIL; 1323 info.tx_enabled = bond_is_active_slave(slave); 1324 netdev_lower_state_changed(slave->dev, &info); 1325 } 1326 1327 /* enslave device <slave> to bond device <master> */ 1328 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) 1329 { 1330 struct bonding *bond = netdev_priv(bond_dev); 1331 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1332 struct slave *new_slave = NULL, *prev_slave; 1333 struct sockaddr addr; 1334 int link_reporting; 1335 int res = 0, i; 1336 1337 if (!bond->params.use_carrier && 1338 slave_dev->ethtool_ops->get_link == NULL && 1339 slave_ops->ndo_do_ioctl == NULL) { 1340 netdev_warn(bond_dev, "no link monitoring support for %s\n", 1341 slave_dev->name); 1342 } 1343 1344 /* already enslaved */ 1345 if (slave_dev->flags & IFF_SLAVE) { 1346 netdev_dbg(bond_dev, "Error: Device was already enslaved\n"); 1347 return -EBUSY; 1348 } 1349 1350 if (bond_dev == slave_dev) { 1351 netdev_err(bond_dev, "cannot enslave bond to itself.\n"); 1352 return -EPERM; 1353 } 1354 1355 /* vlan challenged mutual exclusion */ 1356 /* no need to lock since we're protected by rtnl_lock */ 1357 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1358 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n", 1359 slave_dev->name); 1360 if (vlan_uses_dev(bond_dev)) { 1361 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1362 slave_dev->name, bond_dev->name); 1363 return -EPERM; 1364 } else { 1365 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1366 slave_dev->name, slave_dev->name, 1367 bond_dev->name); 1368 } 1369 } else { 1370 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n", 1371 slave_dev->name); 1372 } 1373 1374 /* Old ifenslave binaries are no longer supported. These can 1375 * be identified with moderate accuracy by the state of the slave: 1376 * the current ifenslave will set the interface down prior to 1377 * enslaving it; the old ifenslave will not. 1378 */ 1379 if (slave_dev->flags & IFF_UP) { 1380 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n", 1381 slave_dev->name); 1382 return -EPERM; 1383 } 1384 1385 /* set bonding device ether type by slave - bonding netdevices are 1386 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1387 * there is a need to override some of the type dependent attribs/funcs. 1388 * 1389 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1390 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1391 */ 1392 if (!bond_has_slaves(bond)) { 1393 if (bond_dev->type != slave_dev->type) { 1394 netdev_dbg(bond_dev, "change device type from %d to %d\n", 1395 bond_dev->type, slave_dev->type); 1396 1397 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1398 bond_dev); 1399 res = notifier_to_errno(res); 1400 if (res) { 1401 netdev_err(bond_dev, "refused to change device type\n"); 1402 return -EBUSY; 1403 } 1404 1405 /* Flush unicast and multicast addresses */ 1406 dev_uc_flush(bond_dev); 1407 dev_mc_flush(bond_dev); 1408 1409 if (slave_dev->type != ARPHRD_ETHER) 1410 bond_setup_by_slave(bond_dev, slave_dev); 1411 else { 1412 ether_setup(bond_dev); 1413 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1414 } 1415 1416 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1417 bond_dev); 1418 } 1419 } else if (bond_dev->type != slave_dev->type) { 1420 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n", 1421 slave_dev->name, slave_dev->type, bond_dev->type); 1422 return -EINVAL; 1423 } 1424 1425 if (slave_dev->type == ARPHRD_INFINIBAND && 1426 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1427 netdev_warn(bond_dev, "Type (%d) supports only active-backup mode\n", 1428 slave_dev->type); 1429 res = -EOPNOTSUPP; 1430 goto err_undo_flags; 1431 } 1432 1433 if (!slave_ops->ndo_set_mac_address || 1434 slave_dev->type == ARPHRD_INFINIBAND) { 1435 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n"); 1436 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1437 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1438 if (!bond_has_slaves(bond)) { 1439 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1440 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1441 } else { 1442 netdev_err(bond_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n"); 1443 res = -EOPNOTSUPP; 1444 goto err_undo_flags; 1445 } 1446 } 1447 } 1448 1449 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1450 1451 /* If this is the first slave, then we need to set the master's hardware 1452 * address to be the same as the slave's. 1453 */ 1454 if (!bond_has_slaves(bond) && 1455 bond->dev->addr_assign_type == NET_ADDR_RANDOM) 1456 bond_set_dev_addr(bond->dev, slave_dev); 1457 1458 new_slave = bond_alloc_slave(bond); 1459 if (!new_slave) { 1460 res = -ENOMEM; 1461 goto err_undo_flags; 1462 } 1463 1464 new_slave->bond = bond; 1465 new_slave->dev = slave_dev; 1466 /* Set the new_slave's queue_id to be zero. Queue ID mapping 1467 * is set via sysfs or module option if desired. 1468 */ 1469 new_slave->queue_id = 0; 1470 1471 /* Save slave's original mtu and then set it to match the bond */ 1472 new_slave->original_mtu = slave_dev->mtu; 1473 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1474 if (res) { 1475 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res); 1476 goto err_free; 1477 } 1478 1479 /* Save slave's original ("permanent") mac address for modes 1480 * that need it, and for restoring it upon release, and then 1481 * set it to the master's address 1482 */ 1483 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr); 1484 1485 if (!bond->params.fail_over_mac || 1486 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1487 /* Set slave to master's mac address. The application already 1488 * set the master's mac address to that of the first slave 1489 */ 1490 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 1491 addr.sa_family = slave_dev->type; 1492 res = dev_set_mac_address(slave_dev, &addr); 1493 if (res) { 1494 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res); 1495 goto err_restore_mtu; 1496 } 1497 } 1498 1499 /* set slave flag before open to prevent IPv6 addrconf */ 1500 slave_dev->flags |= IFF_SLAVE; 1501 1502 /* open the slave since the application closed it */ 1503 res = dev_open(slave_dev); 1504 if (res) { 1505 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name); 1506 goto err_restore_mac; 1507 } 1508 1509 slave_dev->priv_flags |= IFF_BONDING; 1510 /* initialize slave stats */ 1511 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 1512 1513 if (bond_is_lb(bond)) { 1514 /* bond_alb_init_slave() must be called before all other stages since 1515 * it might fail and we do not want to have to undo everything 1516 */ 1517 res = bond_alb_init_slave(bond, new_slave); 1518 if (res) 1519 goto err_close; 1520 } 1521 1522 /* If the mode uses primary, then the following is handled by 1523 * bond_change_active_slave(). 1524 */ 1525 if (!bond_uses_primary(bond)) { 1526 /* set promiscuity level to new slave */ 1527 if (bond_dev->flags & IFF_PROMISC) { 1528 res = dev_set_promiscuity(slave_dev, 1); 1529 if (res) 1530 goto err_close; 1531 } 1532 1533 /* set allmulti level to new slave */ 1534 if (bond_dev->flags & IFF_ALLMULTI) { 1535 res = dev_set_allmulti(slave_dev, 1); 1536 if (res) 1537 goto err_close; 1538 } 1539 1540 netif_addr_lock_bh(bond_dev); 1541 1542 dev_mc_sync_multiple(slave_dev, bond_dev); 1543 dev_uc_sync_multiple(slave_dev, bond_dev); 1544 1545 netif_addr_unlock_bh(bond_dev); 1546 } 1547 1548 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1549 /* add lacpdu mc addr to mc list */ 1550 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1551 1552 dev_mc_add(slave_dev, lacpdu_multicast); 1553 } 1554 1555 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 1556 if (res) { 1557 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n", 1558 slave_dev->name); 1559 goto err_close; 1560 } 1561 1562 prev_slave = bond_last_slave(bond); 1563 1564 new_slave->delay = 0; 1565 new_slave->link_failure_count = 0; 1566 1567 bond_update_speed_duplex(new_slave); 1568 1569 new_slave->last_rx = jiffies - 1570 (msecs_to_jiffies(bond->params.arp_interval) + 1); 1571 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 1572 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 1573 1574 if (bond->params.miimon && !bond->params.use_carrier) { 1575 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1576 1577 if ((link_reporting == -1) && !bond->params.arp_interval) { 1578 /* miimon is set but a bonded network driver 1579 * does not support ETHTOOL/MII and 1580 * arp_interval is not set. Note: if 1581 * use_carrier is enabled, we will never go 1582 * here (because netif_carrier is always 1583 * supported); thus, we don't need to change 1584 * the messages for netif_carrier. 1585 */ 1586 netdev_warn(bond_dev, "MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n", 1587 slave_dev->name); 1588 } else if (link_reporting == -1) { 1589 /* unable get link status using mii/ethtool */ 1590 netdev_warn(bond_dev, "can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n", 1591 slave_dev->name); 1592 } 1593 } 1594 1595 /* check for initial state */ 1596 new_slave->link = BOND_LINK_NOCHANGE; 1597 if (bond->params.miimon) { 1598 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 1599 if (bond->params.updelay) { 1600 bond_set_slave_link_state(new_slave, 1601 BOND_LINK_BACK, 1602 BOND_SLAVE_NOTIFY_NOW); 1603 new_slave->delay = bond->params.updelay; 1604 } else { 1605 bond_set_slave_link_state(new_slave, 1606 BOND_LINK_UP, 1607 BOND_SLAVE_NOTIFY_NOW); 1608 } 1609 } else { 1610 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 1611 BOND_SLAVE_NOTIFY_NOW); 1612 } 1613 } else if (bond->params.arp_interval) { 1614 bond_set_slave_link_state(new_slave, 1615 (netif_carrier_ok(slave_dev) ? 1616 BOND_LINK_UP : BOND_LINK_DOWN), 1617 BOND_SLAVE_NOTIFY_NOW); 1618 } else { 1619 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 1620 BOND_SLAVE_NOTIFY_NOW); 1621 } 1622 1623 if (new_slave->link != BOND_LINK_DOWN) 1624 new_slave->last_link_up = jiffies; 1625 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n", 1626 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 1627 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 1628 1629 if (bond_uses_primary(bond) && bond->params.primary[0]) { 1630 /* if there is a primary slave, remember it */ 1631 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1632 rcu_assign_pointer(bond->primary_slave, new_slave); 1633 bond->force_primary = true; 1634 } 1635 } 1636 1637 switch (BOND_MODE(bond)) { 1638 case BOND_MODE_ACTIVEBACKUP: 1639 bond_set_slave_inactive_flags(new_slave, 1640 BOND_SLAVE_NOTIFY_NOW); 1641 break; 1642 case BOND_MODE_8023AD: 1643 /* in 802.3ad mode, the internal mechanism 1644 * will activate the slaves in the selected 1645 * aggregator 1646 */ 1647 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1648 /* if this is the first slave */ 1649 if (!prev_slave) { 1650 SLAVE_AD_INFO(new_slave)->id = 1; 1651 /* Initialize AD with the number of times that the AD timer is called in 1 second 1652 * can be called only after the mac address of the bond is set 1653 */ 1654 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 1655 } else { 1656 SLAVE_AD_INFO(new_slave)->id = 1657 SLAVE_AD_INFO(prev_slave)->id + 1; 1658 } 1659 1660 bond_3ad_bind_slave(new_slave); 1661 break; 1662 case BOND_MODE_TLB: 1663 case BOND_MODE_ALB: 1664 bond_set_active_slave(new_slave); 1665 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1666 break; 1667 default: 1668 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n"); 1669 1670 /* always active in trunk mode */ 1671 bond_set_active_slave(new_slave); 1672 1673 /* In trunking mode there is little meaning to curr_active_slave 1674 * anyway (it holds no special properties of the bond device), 1675 * so we can change it without calling change_active_interface() 1676 */ 1677 if (!rcu_access_pointer(bond->curr_active_slave) && 1678 new_slave->link == BOND_LINK_UP) 1679 rcu_assign_pointer(bond->curr_active_slave, new_slave); 1680 1681 break; 1682 } /* switch(bond_mode) */ 1683 1684 #ifdef CONFIG_NET_POLL_CONTROLLER 1685 slave_dev->npinfo = bond->dev->npinfo; 1686 if (slave_dev->npinfo) { 1687 if (slave_enable_netpoll(new_slave)) { 1688 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 1689 res = -EBUSY; 1690 goto err_detach; 1691 } 1692 } 1693 #endif 1694 1695 if (!(bond_dev->features & NETIF_F_LRO)) 1696 dev_disable_lro(slave_dev); 1697 1698 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1699 new_slave); 1700 if (res) { 1701 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res); 1702 goto err_detach; 1703 } 1704 1705 res = bond_master_upper_dev_link(bond, new_slave); 1706 if (res) { 1707 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res); 1708 goto err_unregister; 1709 } 1710 1711 res = bond_sysfs_slave_add(new_slave); 1712 if (res) { 1713 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res); 1714 goto err_upper_unlink; 1715 } 1716 1717 bond->slave_cnt++; 1718 bond_compute_features(bond); 1719 bond_set_carrier(bond); 1720 1721 if (bond_uses_primary(bond)) { 1722 block_netpoll_tx(); 1723 bond_select_active_slave(bond); 1724 unblock_netpoll_tx(); 1725 } 1726 1727 if (bond_mode_uses_xmit_hash(bond)) 1728 bond_update_slave_arr(bond, NULL); 1729 1730 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n", 1731 slave_dev->name, 1732 bond_is_active_slave(new_slave) ? "an active" : "a backup", 1733 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 1734 1735 /* enslave is successful */ 1736 bond_queue_slave_event(new_slave); 1737 return 0; 1738 1739 /* Undo stages on error */ 1740 err_upper_unlink: 1741 bond_upper_dev_unlink(bond, new_slave); 1742 1743 err_unregister: 1744 netdev_rx_handler_unregister(slave_dev); 1745 1746 err_detach: 1747 if (!bond_uses_primary(bond)) 1748 bond_hw_addr_flush(bond_dev, slave_dev); 1749 1750 vlan_vids_del_by_dev(slave_dev, bond_dev); 1751 if (rcu_access_pointer(bond->primary_slave) == new_slave) 1752 RCU_INIT_POINTER(bond->primary_slave, NULL); 1753 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 1754 block_netpoll_tx(); 1755 bond_change_active_slave(bond, NULL); 1756 bond_select_active_slave(bond); 1757 unblock_netpoll_tx(); 1758 } 1759 /* either primary_slave or curr_active_slave might've changed */ 1760 synchronize_rcu(); 1761 slave_disable_netpoll(new_slave); 1762 1763 err_close: 1764 slave_dev->priv_flags &= ~IFF_BONDING; 1765 dev_close(slave_dev); 1766 1767 err_restore_mac: 1768 slave_dev->flags &= ~IFF_SLAVE; 1769 if (!bond->params.fail_over_mac || 1770 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1771 /* XXX TODO - fom follow mode needs to change master's 1772 * MAC if this slave's MAC is in use by the bond, or at 1773 * least print a warning. 1774 */ 1775 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr); 1776 addr.sa_family = slave_dev->type; 1777 dev_set_mac_address(slave_dev, &addr); 1778 } 1779 1780 err_restore_mtu: 1781 dev_set_mtu(slave_dev, new_slave->original_mtu); 1782 1783 err_free: 1784 bond_free_slave(new_slave); 1785 1786 err_undo_flags: 1787 /* Enslave of first slave has failed and we need to fix master's mac */ 1788 if (!bond_has_slaves(bond)) { 1789 if (ether_addr_equal_64bits(bond_dev->dev_addr, 1790 slave_dev->dev_addr)) 1791 eth_hw_addr_random(bond_dev); 1792 if (bond_dev->type != ARPHRD_ETHER) { 1793 dev_close(bond_dev); 1794 ether_setup(bond_dev); 1795 bond_dev->flags |= IFF_MASTER; 1796 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1797 } 1798 } 1799 1800 return res; 1801 } 1802 1803 /* Try to release the slave device <slave> from the bond device <master> 1804 * It is legal to access curr_active_slave without a lock because all the function 1805 * is RTNL-locked. If "all" is true it means that the function is being called 1806 * while destroying a bond interface and all slaves are being released. 1807 * 1808 * The rules for slave state should be: 1809 * for Active/Backup: 1810 * Active stays on all backups go down 1811 * for Bonded connections: 1812 * The first up interface should be left on and all others downed. 1813 */ 1814 static int __bond_release_one(struct net_device *bond_dev, 1815 struct net_device *slave_dev, 1816 bool all) 1817 { 1818 struct bonding *bond = netdev_priv(bond_dev); 1819 struct slave *slave, *oldcurrent; 1820 struct sockaddr addr; 1821 int old_flags = bond_dev->flags; 1822 netdev_features_t old_features = bond_dev->features; 1823 1824 /* slave is not a slave or master is not master of this slave */ 1825 if (!(slave_dev->flags & IFF_SLAVE) || 1826 !netdev_has_upper_dev(slave_dev, bond_dev)) { 1827 netdev_dbg(bond_dev, "cannot release %s\n", 1828 slave_dev->name); 1829 return -EINVAL; 1830 } 1831 1832 block_netpoll_tx(); 1833 1834 slave = bond_get_slave_by_dev(bond, slave_dev); 1835 if (!slave) { 1836 /* not a slave of this bond */ 1837 netdev_info(bond_dev, "%s not enslaved\n", 1838 slave_dev->name); 1839 unblock_netpoll_tx(); 1840 return -EINVAL; 1841 } 1842 1843 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 1844 1845 bond_sysfs_slave_del(slave); 1846 1847 /* recompute stats just before removing the slave */ 1848 bond_get_stats(bond->dev, &bond->bond_stats); 1849 1850 bond_upper_dev_unlink(bond, slave); 1851 /* unregister rx_handler early so bond_handle_frame wouldn't be called 1852 * for this slave anymore. 1853 */ 1854 netdev_rx_handler_unregister(slave_dev); 1855 1856 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1857 bond_3ad_unbind_slave(slave); 1858 1859 if (bond_mode_uses_xmit_hash(bond)) 1860 bond_update_slave_arr(bond, slave); 1861 1862 netdev_info(bond_dev, "Releasing %s interface %s\n", 1863 bond_is_active_slave(slave) ? "active" : "backup", 1864 slave_dev->name); 1865 1866 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 1867 1868 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 1869 1870 if (!all && (!bond->params.fail_over_mac || 1871 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 1872 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 1873 bond_has_slaves(bond)) 1874 netdev_warn(bond_dev, "the permanent HWaddr of %s - %pM - is still in use by %s - set the HWaddr of %s to a different address to avoid conflicts\n", 1875 slave_dev->name, slave->perm_hwaddr, 1876 bond_dev->name, slave_dev->name); 1877 } 1878 1879 if (rtnl_dereference(bond->primary_slave) == slave) 1880 RCU_INIT_POINTER(bond->primary_slave, NULL); 1881 1882 if (oldcurrent == slave) 1883 bond_change_active_slave(bond, NULL); 1884 1885 if (bond_is_lb(bond)) { 1886 /* Must be called only after the slave has been 1887 * detached from the list and the curr_active_slave 1888 * has been cleared (if our_slave == old_current), 1889 * but before a new active slave is selected. 1890 */ 1891 bond_alb_deinit_slave(bond, slave); 1892 } 1893 1894 if (all) { 1895 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 1896 } else if (oldcurrent == slave) { 1897 /* Note that we hold RTNL over this sequence, so there 1898 * is no concern that another slave add/remove event 1899 * will interfere. 1900 */ 1901 bond_select_active_slave(bond); 1902 } 1903 1904 if (!bond_has_slaves(bond)) { 1905 bond_set_carrier(bond); 1906 eth_hw_addr_random(bond_dev); 1907 } 1908 1909 unblock_netpoll_tx(); 1910 synchronize_rcu(); 1911 bond->slave_cnt--; 1912 1913 if (!bond_has_slaves(bond)) { 1914 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 1915 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 1916 } 1917 1918 bond_compute_features(bond); 1919 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 1920 (old_features & NETIF_F_VLAN_CHALLENGED)) 1921 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n", 1922 slave_dev->name, bond_dev->name); 1923 1924 vlan_vids_del_by_dev(slave_dev, bond_dev); 1925 1926 /* If the mode uses primary, then this case was handled above by 1927 * bond_change_active_slave(..., NULL) 1928 */ 1929 if (!bond_uses_primary(bond)) { 1930 /* unset promiscuity level from slave 1931 * NOTE: The NETDEV_CHANGEADDR call above may change the value 1932 * of the IFF_PROMISC flag in the bond_dev, but we need the 1933 * value of that flag before that change, as that was the value 1934 * when this slave was attached, so we cache at the start of the 1935 * function and use it here. Same goes for ALLMULTI below 1936 */ 1937 if (old_flags & IFF_PROMISC) 1938 dev_set_promiscuity(slave_dev, -1); 1939 1940 /* unset allmulti level from slave */ 1941 if (old_flags & IFF_ALLMULTI) 1942 dev_set_allmulti(slave_dev, -1); 1943 1944 bond_hw_addr_flush(bond_dev, slave_dev); 1945 } 1946 1947 slave_disable_netpoll(slave); 1948 1949 /* close slave before restoring its mac address */ 1950 dev_close(slave_dev); 1951 1952 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 1953 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1954 /* restore original ("permanent") mac address */ 1955 ether_addr_copy(addr.sa_data, slave->perm_hwaddr); 1956 addr.sa_family = slave_dev->type; 1957 dev_set_mac_address(slave_dev, &addr); 1958 } 1959 1960 dev_set_mtu(slave_dev, slave->original_mtu); 1961 1962 slave_dev->priv_flags &= ~IFF_BONDING; 1963 1964 bond_free_slave(slave); 1965 1966 return 0; 1967 } 1968 1969 /* A wrapper used because of ndo_del_link */ 1970 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 1971 { 1972 return __bond_release_one(bond_dev, slave_dev, false); 1973 } 1974 1975 /* First release a slave and then destroy the bond if no more slaves are left. 1976 * Must be under rtnl_lock when this function is called. 1977 */ 1978 static int bond_release_and_destroy(struct net_device *bond_dev, 1979 struct net_device *slave_dev) 1980 { 1981 struct bonding *bond = netdev_priv(bond_dev); 1982 int ret; 1983 1984 ret = bond_release(bond_dev, slave_dev); 1985 if (ret == 0 && !bond_has_slaves(bond)) { 1986 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 1987 netdev_info(bond_dev, "Destroying bond %s\n", 1988 bond_dev->name); 1989 bond_remove_proc_entry(bond); 1990 unregister_netdevice(bond_dev); 1991 } 1992 return ret; 1993 } 1994 1995 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) 1996 { 1997 struct bonding *bond = netdev_priv(bond_dev); 1998 bond_fill_ifbond(bond, info); 1999 return 0; 2000 } 2001 2002 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2003 { 2004 struct bonding *bond = netdev_priv(bond_dev); 2005 struct list_head *iter; 2006 int i = 0, res = -ENODEV; 2007 struct slave *slave; 2008 2009 bond_for_each_slave(bond, slave, iter) { 2010 if (i++ == (int)info->slave_id) { 2011 res = 0; 2012 bond_fill_ifslave(slave, info); 2013 break; 2014 } 2015 } 2016 2017 return res; 2018 } 2019 2020 /*-------------------------------- Monitoring -------------------------------*/ 2021 2022 /* called with rcu_read_lock() */ 2023 static int bond_miimon_inspect(struct bonding *bond) 2024 { 2025 int link_state, commit = 0; 2026 struct list_head *iter; 2027 struct slave *slave; 2028 bool ignore_updelay; 2029 2030 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2031 2032 bond_for_each_slave_rcu(bond, slave, iter) { 2033 slave->new_link = BOND_LINK_NOCHANGE; 2034 2035 link_state = bond_check_dev_link(bond, slave->dev, 0); 2036 2037 switch (slave->link) { 2038 case BOND_LINK_UP: 2039 if (link_state) 2040 continue; 2041 2042 bond_set_slave_link_state(slave, BOND_LINK_FAIL, 2043 BOND_SLAVE_NOTIFY_LATER); 2044 slave->delay = bond->params.downdelay; 2045 if (slave->delay) { 2046 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n", 2047 (BOND_MODE(bond) == 2048 BOND_MODE_ACTIVEBACKUP) ? 2049 (bond_is_active_slave(slave) ? 2050 "active " : "backup ") : "", 2051 slave->dev->name, 2052 bond->params.downdelay * bond->params.miimon); 2053 } 2054 /*FALLTHRU*/ 2055 case BOND_LINK_FAIL: 2056 if (link_state) { 2057 /* recovered before downdelay expired */ 2058 bond_set_slave_link_state(slave, BOND_LINK_UP, 2059 BOND_SLAVE_NOTIFY_LATER); 2060 slave->last_link_up = jiffies; 2061 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n", 2062 (bond->params.downdelay - slave->delay) * 2063 bond->params.miimon, 2064 slave->dev->name); 2065 continue; 2066 } 2067 2068 if (slave->delay <= 0) { 2069 slave->new_link = BOND_LINK_DOWN; 2070 commit++; 2071 continue; 2072 } 2073 2074 slave->delay--; 2075 break; 2076 2077 case BOND_LINK_DOWN: 2078 if (!link_state) 2079 continue; 2080 2081 bond_set_slave_link_state(slave, BOND_LINK_BACK, 2082 BOND_SLAVE_NOTIFY_LATER); 2083 slave->delay = bond->params.updelay; 2084 2085 if (slave->delay) { 2086 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n", 2087 slave->dev->name, 2088 ignore_updelay ? 0 : 2089 bond->params.updelay * 2090 bond->params.miimon); 2091 } 2092 /*FALLTHRU*/ 2093 case BOND_LINK_BACK: 2094 if (!link_state) { 2095 bond_set_slave_link_state(slave, 2096 BOND_LINK_DOWN, 2097 BOND_SLAVE_NOTIFY_LATER); 2098 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n", 2099 (bond->params.updelay - slave->delay) * 2100 bond->params.miimon, 2101 slave->dev->name); 2102 2103 continue; 2104 } 2105 2106 if (ignore_updelay) 2107 slave->delay = 0; 2108 2109 if (slave->delay <= 0) { 2110 slave->new_link = BOND_LINK_UP; 2111 commit++; 2112 ignore_updelay = false; 2113 continue; 2114 } 2115 2116 slave->delay--; 2117 break; 2118 } 2119 } 2120 2121 return commit; 2122 } 2123 2124 static void bond_miimon_commit(struct bonding *bond) 2125 { 2126 struct list_head *iter; 2127 struct slave *slave, *primary; 2128 2129 bond_for_each_slave(bond, slave, iter) { 2130 switch (slave->new_link) { 2131 case BOND_LINK_NOCHANGE: 2132 continue; 2133 2134 case BOND_LINK_UP: 2135 bond_update_speed_duplex(slave); 2136 bond_set_slave_link_state(slave, BOND_LINK_UP, 2137 BOND_SLAVE_NOTIFY_NOW); 2138 slave->last_link_up = jiffies; 2139 2140 primary = rtnl_dereference(bond->primary_slave); 2141 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2142 /* prevent it from being the active one */ 2143 bond_set_backup_slave(slave); 2144 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2145 /* make it immediately active */ 2146 bond_set_active_slave(slave); 2147 } else if (slave != primary) { 2148 /* prevent it from being the active one */ 2149 bond_set_backup_slave(slave); 2150 } 2151 2152 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n", 2153 slave->dev->name, 2154 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2155 slave->duplex ? "full" : "half"); 2156 2157 /* notify ad that the link status has changed */ 2158 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2159 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2160 2161 if (bond_is_lb(bond)) 2162 bond_alb_handle_link_change(bond, slave, 2163 BOND_LINK_UP); 2164 2165 if (BOND_MODE(bond) == BOND_MODE_XOR) 2166 bond_update_slave_arr(bond, NULL); 2167 2168 if (!bond->curr_active_slave || slave == primary) 2169 goto do_failover; 2170 2171 continue; 2172 2173 case BOND_LINK_DOWN: 2174 if (slave->link_failure_count < UINT_MAX) 2175 slave->link_failure_count++; 2176 2177 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2178 BOND_SLAVE_NOTIFY_NOW); 2179 2180 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2181 BOND_MODE(bond) == BOND_MODE_8023AD) 2182 bond_set_slave_inactive_flags(slave, 2183 BOND_SLAVE_NOTIFY_NOW); 2184 2185 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2186 slave->dev->name); 2187 2188 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2189 bond_3ad_handle_link_change(slave, 2190 BOND_LINK_DOWN); 2191 2192 if (bond_is_lb(bond)) 2193 bond_alb_handle_link_change(bond, slave, 2194 BOND_LINK_DOWN); 2195 2196 if (BOND_MODE(bond) == BOND_MODE_XOR) 2197 bond_update_slave_arr(bond, NULL); 2198 2199 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2200 goto do_failover; 2201 2202 continue; 2203 2204 default: 2205 netdev_err(bond->dev, "invalid new link %d on slave %s\n", 2206 slave->new_link, slave->dev->name); 2207 slave->new_link = BOND_LINK_NOCHANGE; 2208 2209 continue; 2210 } 2211 2212 do_failover: 2213 block_netpoll_tx(); 2214 bond_select_active_slave(bond); 2215 unblock_netpoll_tx(); 2216 } 2217 2218 bond_set_carrier(bond); 2219 } 2220 2221 /* bond_mii_monitor 2222 * 2223 * Really a wrapper that splits the mii monitor into two phases: an 2224 * inspection, then (if inspection indicates something needs to be done) 2225 * an acquisition of appropriate locks followed by a commit phase to 2226 * implement whatever link state changes are indicated. 2227 */ 2228 static void bond_mii_monitor(struct work_struct *work) 2229 { 2230 struct bonding *bond = container_of(work, struct bonding, 2231 mii_work.work); 2232 bool should_notify_peers = false; 2233 unsigned long delay; 2234 2235 delay = msecs_to_jiffies(bond->params.miimon); 2236 2237 if (!bond_has_slaves(bond)) 2238 goto re_arm; 2239 2240 rcu_read_lock(); 2241 2242 should_notify_peers = bond_should_notify_peers(bond); 2243 2244 if (bond_miimon_inspect(bond)) { 2245 rcu_read_unlock(); 2246 2247 /* Race avoidance with bond_close cancel of workqueue */ 2248 if (!rtnl_trylock()) { 2249 delay = 1; 2250 should_notify_peers = false; 2251 goto re_arm; 2252 } 2253 2254 bond_miimon_commit(bond); 2255 2256 rtnl_unlock(); /* might sleep, hold no other locks */ 2257 } else 2258 rcu_read_unlock(); 2259 2260 re_arm: 2261 if (bond->params.miimon) 2262 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2263 2264 if (should_notify_peers) { 2265 if (!rtnl_trylock()) 2266 return; 2267 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2268 rtnl_unlock(); 2269 } 2270 } 2271 2272 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2273 { 2274 struct net_device *upper; 2275 struct list_head *iter; 2276 bool ret = false; 2277 2278 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2279 return true; 2280 2281 rcu_read_lock(); 2282 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { 2283 if (ip == bond_confirm_addr(upper, 0, ip)) { 2284 ret = true; 2285 break; 2286 } 2287 } 2288 rcu_read_unlock(); 2289 2290 return ret; 2291 } 2292 2293 /* We go to the (large) trouble of VLAN tagging ARP frames because 2294 * switches in VLAN mode (especially if ports are configured as 2295 * "native" to a VLAN) might not pass non-tagged frames. 2296 */ 2297 static void bond_arp_send(struct net_device *slave_dev, int arp_op, 2298 __be32 dest_ip, __be32 src_ip, 2299 struct bond_vlan_tag *tags) 2300 { 2301 struct sk_buff *skb; 2302 struct bond_vlan_tag *outer_tag = tags; 2303 2304 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n", 2305 arp_op, slave_dev->name, &dest_ip, &src_ip); 2306 2307 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2308 NULL, slave_dev->dev_addr, NULL); 2309 2310 if (!skb) { 2311 net_err_ratelimited("ARP packet allocation failed\n"); 2312 return; 2313 } 2314 2315 if (!tags || tags->vlan_proto == VLAN_N_VID) 2316 goto xmit; 2317 2318 tags++; 2319 2320 /* Go through all the tags backwards and add them to the packet */ 2321 while (tags->vlan_proto != VLAN_N_VID) { 2322 if (!tags->vlan_id) { 2323 tags++; 2324 continue; 2325 } 2326 2327 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n", 2328 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2329 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2330 tags->vlan_id); 2331 if (!skb) { 2332 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2333 return; 2334 } 2335 2336 tags++; 2337 } 2338 /* Set the outer tag */ 2339 if (outer_tag->vlan_id) { 2340 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n", 2341 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2342 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2343 outer_tag->vlan_id); 2344 } 2345 2346 xmit: 2347 arp_xmit(skb); 2348 } 2349 2350 /* Validate the device path between the @start_dev and the @end_dev. 2351 * The path is valid if the @end_dev is reachable through device 2352 * stacking. 2353 * When the path is validated, collect any vlan information in the 2354 * path. 2355 */ 2356 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2357 struct net_device *end_dev, 2358 int level) 2359 { 2360 struct bond_vlan_tag *tags; 2361 struct net_device *upper; 2362 struct list_head *iter; 2363 2364 if (start_dev == end_dev) { 2365 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC); 2366 if (!tags) 2367 return ERR_PTR(-ENOMEM); 2368 tags[level].vlan_proto = VLAN_N_VID; 2369 return tags; 2370 } 2371 2372 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2373 tags = bond_verify_device_path(upper, end_dev, level + 1); 2374 if (IS_ERR_OR_NULL(tags)) { 2375 if (IS_ERR(tags)) 2376 return tags; 2377 continue; 2378 } 2379 if (is_vlan_dev(upper)) { 2380 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2381 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2382 } 2383 2384 return tags; 2385 } 2386 2387 return NULL; 2388 } 2389 2390 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2391 { 2392 struct rtable *rt; 2393 struct bond_vlan_tag *tags; 2394 __be32 *targets = bond->params.arp_targets, addr; 2395 int i; 2396 2397 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2398 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]); 2399 tags = NULL; 2400 2401 /* Find out through which dev should the packet go */ 2402 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2403 RTO_ONLINK, 0); 2404 if (IS_ERR(rt)) { 2405 /* there's no route to target - try to send arp 2406 * probe to generate any traffic (arp_validate=0) 2407 */ 2408 if (bond->params.arp_validate) 2409 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 2410 bond->dev->name, 2411 &targets[i]); 2412 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2413 0, tags); 2414 continue; 2415 } 2416 2417 /* bond device itself */ 2418 if (rt->dst.dev == bond->dev) 2419 goto found; 2420 2421 rcu_read_lock(); 2422 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 2423 rcu_read_unlock(); 2424 2425 if (!IS_ERR_OR_NULL(tags)) 2426 goto found; 2427 2428 /* Not our device - skip */ 2429 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 2430 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 2431 2432 ip_rt_put(rt); 2433 continue; 2434 2435 found: 2436 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 2437 ip_rt_put(rt); 2438 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2439 addr, tags); 2440 kfree(tags); 2441 } 2442 } 2443 2444 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2445 { 2446 int i; 2447 2448 if (!sip || !bond_has_this_ip(bond, tip)) { 2449 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n", 2450 &sip, &tip); 2451 return; 2452 } 2453 2454 i = bond_get_targets_ip(bond->params.arp_targets, sip); 2455 if (i == -1) { 2456 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n", 2457 &sip); 2458 return; 2459 } 2460 slave->last_rx = jiffies; 2461 slave->target_last_arp_rx[i] = jiffies; 2462 } 2463 2464 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 2465 struct slave *slave) 2466 { 2467 struct arphdr *arp = (struct arphdr *)skb->data; 2468 struct slave *curr_active_slave, *curr_arp_slave; 2469 unsigned char *arp_ptr; 2470 __be32 sip, tip; 2471 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 2472 2473 if (!slave_do_arp_validate(bond, slave)) { 2474 if ((slave_do_arp_validate_only(bond) && is_arp) || 2475 !slave_do_arp_validate_only(bond)) 2476 slave->last_rx = jiffies; 2477 return RX_HANDLER_ANOTHER; 2478 } else if (!is_arp) { 2479 return RX_HANDLER_ANOTHER; 2480 } 2481 2482 alen = arp_hdr_len(bond->dev); 2483 2484 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n", 2485 skb->dev->name); 2486 2487 if (alen > skb_headlen(skb)) { 2488 arp = kmalloc(alen, GFP_ATOMIC); 2489 if (!arp) 2490 goto out_unlock; 2491 if (skb_copy_bits(skb, 0, arp, alen) < 0) 2492 goto out_unlock; 2493 } 2494 2495 if (arp->ar_hln != bond->dev->addr_len || 2496 skb->pkt_type == PACKET_OTHERHOST || 2497 skb->pkt_type == PACKET_LOOPBACK || 2498 arp->ar_hrd != htons(ARPHRD_ETHER) || 2499 arp->ar_pro != htons(ETH_P_IP) || 2500 arp->ar_pln != 4) 2501 goto out_unlock; 2502 2503 arp_ptr = (unsigned char *)(arp + 1); 2504 arp_ptr += bond->dev->addr_len; 2505 memcpy(&sip, arp_ptr, 4); 2506 arp_ptr += 4 + bond->dev->addr_len; 2507 memcpy(&tip, arp_ptr, 4); 2508 2509 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2510 slave->dev->name, bond_slave_state(slave), 2511 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2512 &sip, &tip); 2513 2514 curr_active_slave = rcu_dereference(bond->curr_active_slave); 2515 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 2516 2517 /* We 'trust' the received ARP enough to validate it if: 2518 * 2519 * (a) the slave receiving the ARP is active (which includes the 2520 * current ARP slave, if any), or 2521 * 2522 * (b) the receiving slave isn't active, but there is a currently 2523 * active slave and it received valid arp reply(s) after it became 2524 * the currently active slave, or 2525 * 2526 * (c) there is an ARP slave that sent an ARP during the prior ARP 2527 * interval, and we receive an ARP reply on any slave. We accept 2528 * these because switch FDB update delays may deliver the ARP 2529 * reply to a slave other than the sender of the ARP request. 2530 * 2531 * Note: for (b), backup slaves are receiving the broadcast ARP 2532 * request, not a reply. This request passes from the sending 2533 * slave through the L2 switch(es) to the receiving slave. Since 2534 * this is checking the request, sip/tip are swapped for 2535 * validation. 2536 * 2537 * This is done to avoid endless looping when we can't reach the 2538 * arp_ip_target and fool ourselves with our own arp requests. 2539 */ 2540 if (bond_is_active_slave(slave)) 2541 bond_validate_arp(bond, slave, sip, tip); 2542 else if (curr_active_slave && 2543 time_after(slave_last_rx(bond, curr_active_slave), 2544 curr_active_slave->last_link_up)) 2545 bond_validate_arp(bond, slave, tip, sip); 2546 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 2547 bond_time_in_interval(bond, 2548 dev_trans_start(curr_arp_slave->dev), 1)) 2549 bond_validate_arp(bond, slave, sip, tip); 2550 2551 out_unlock: 2552 if (arp != (struct arphdr *)skb->data) 2553 kfree(arp); 2554 return RX_HANDLER_ANOTHER; 2555 } 2556 2557 /* function to verify if we're in the arp_interval timeslice, returns true if 2558 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 2559 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 2560 */ 2561 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 2562 int mod) 2563 { 2564 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2565 2566 return time_in_range(jiffies, 2567 last_act - delta_in_ticks, 2568 last_act + mod * delta_in_ticks + delta_in_ticks/2); 2569 } 2570 2571 /* This function is called regularly to monitor each slave's link 2572 * ensuring that traffic is being sent and received when arp monitoring 2573 * is used in load-balancing mode. if the adapter has been dormant, then an 2574 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2575 * arp monitoring in active backup mode. 2576 */ 2577 static void bond_loadbalance_arp_mon(struct work_struct *work) 2578 { 2579 struct bonding *bond = container_of(work, struct bonding, 2580 arp_work.work); 2581 struct slave *slave, *oldcurrent; 2582 struct list_head *iter; 2583 int do_failover = 0, slave_state_changed = 0; 2584 2585 if (!bond_has_slaves(bond)) 2586 goto re_arm; 2587 2588 rcu_read_lock(); 2589 2590 oldcurrent = rcu_dereference(bond->curr_active_slave); 2591 /* see if any of the previous devices are up now (i.e. they have 2592 * xmt and rcv traffic). the curr_active_slave does not come into 2593 * the picture unless it is null. also, slave->last_link_up is not 2594 * needed here because we send an arp on each slave and give a slave 2595 * as long as it needs to get the tx/rx within the delta. 2596 * TODO: what about up/down delay in arp mode? it wasn't here before 2597 * so it can wait 2598 */ 2599 bond_for_each_slave_rcu(bond, slave, iter) { 2600 unsigned long trans_start = dev_trans_start(slave->dev); 2601 2602 if (slave->link != BOND_LINK_UP) { 2603 if (bond_time_in_interval(bond, trans_start, 1) && 2604 bond_time_in_interval(bond, slave->last_rx, 1)) { 2605 2606 slave->link = BOND_LINK_UP; 2607 slave_state_changed = 1; 2608 2609 /* primary_slave has no meaning in round-robin 2610 * mode. the window of a slave being up and 2611 * curr_active_slave being null after enslaving 2612 * is closed. 2613 */ 2614 if (!oldcurrent) { 2615 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2616 slave->dev->name); 2617 do_failover = 1; 2618 } else { 2619 netdev_info(bond->dev, "interface %s is now up\n", 2620 slave->dev->name); 2621 } 2622 } 2623 } else { 2624 /* slave->link == BOND_LINK_UP */ 2625 2626 /* not all switches will respond to an arp request 2627 * when the source ip is 0, so don't take the link down 2628 * if we don't know our ip yet 2629 */ 2630 if (!bond_time_in_interval(bond, trans_start, 2) || 2631 !bond_time_in_interval(bond, slave->last_rx, 2)) { 2632 2633 slave->link = BOND_LINK_DOWN; 2634 slave_state_changed = 1; 2635 2636 if (slave->link_failure_count < UINT_MAX) 2637 slave->link_failure_count++; 2638 2639 netdev_info(bond->dev, "interface %s is now down\n", 2640 slave->dev->name); 2641 2642 if (slave == oldcurrent) 2643 do_failover = 1; 2644 } 2645 } 2646 2647 /* note: if switch is in round-robin mode, all links 2648 * must tx arp to ensure all links rx an arp - otherwise 2649 * links may oscillate or not come up at all; if switch is 2650 * in something like xor mode, there is nothing we can 2651 * do - all replies will be rx'ed on same link causing slaves 2652 * to be unstable during low/no traffic periods 2653 */ 2654 if (bond_slave_is_up(slave)) 2655 bond_arp_send_all(bond, slave); 2656 } 2657 2658 rcu_read_unlock(); 2659 2660 if (do_failover || slave_state_changed) { 2661 if (!rtnl_trylock()) 2662 goto re_arm; 2663 2664 if (slave_state_changed) { 2665 bond_slave_state_change(bond); 2666 if (BOND_MODE(bond) == BOND_MODE_XOR) 2667 bond_update_slave_arr(bond, NULL); 2668 } 2669 if (do_failover) { 2670 block_netpoll_tx(); 2671 bond_select_active_slave(bond); 2672 unblock_netpoll_tx(); 2673 } 2674 rtnl_unlock(); 2675 } 2676 2677 re_arm: 2678 if (bond->params.arp_interval) 2679 queue_delayed_work(bond->wq, &bond->arp_work, 2680 msecs_to_jiffies(bond->params.arp_interval)); 2681 } 2682 2683 /* Called to inspect slaves for active-backup mode ARP monitor link state 2684 * changes. Sets new_link in slaves to specify what action should take 2685 * place for the slave. Returns 0 if no changes are found, >0 if changes 2686 * to link states must be committed. 2687 * 2688 * Called with rcu_read_lock held. 2689 */ 2690 static int bond_ab_arp_inspect(struct bonding *bond) 2691 { 2692 unsigned long trans_start, last_rx; 2693 struct list_head *iter; 2694 struct slave *slave; 2695 int commit = 0; 2696 2697 bond_for_each_slave_rcu(bond, slave, iter) { 2698 slave->new_link = BOND_LINK_NOCHANGE; 2699 last_rx = slave_last_rx(bond, slave); 2700 2701 if (slave->link != BOND_LINK_UP) { 2702 if (bond_time_in_interval(bond, last_rx, 1)) { 2703 slave->new_link = BOND_LINK_UP; 2704 commit++; 2705 } 2706 continue; 2707 } 2708 2709 /* Give slaves 2*delta after being enslaved or made 2710 * active. This avoids bouncing, as the last receive 2711 * times need a full ARP monitor cycle to be updated. 2712 */ 2713 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 2714 continue; 2715 2716 /* Backup slave is down if: 2717 * - No current_arp_slave AND 2718 * - more than 3*delta since last receive AND 2719 * - the bond has an IP address 2720 * 2721 * Note: a non-null current_arp_slave indicates 2722 * the curr_active_slave went down and we are 2723 * searching for a new one; under this condition 2724 * we only take the curr_active_slave down - this 2725 * gives each slave a chance to tx/rx traffic 2726 * before being taken out 2727 */ 2728 if (!bond_is_active_slave(slave) && 2729 !rcu_access_pointer(bond->current_arp_slave) && 2730 !bond_time_in_interval(bond, last_rx, 3)) { 2731 slave->new_link = BOND_LINK_DOWN; 2732 commit++; 2733 } 2734 2735 /* Active slave is down if: 2736 * - more than 2*delta since transmitting OR 2737 * - (more than 2*delta since receive AND 2738 * the bond has an IP address) 2739 */ 2740 trans_start = dev_trans_start(slave->dev); 2741 if (bond_is_active_slave(slave) && 2742 (!bond_time_in_interval(bond, trans_start, 2) || 2743 !bond_time_in_interval(bond, last_rx, 2))) { 2744 slave->new_link = BOND_LINK_DOWN; 2745 commit++; 2746 } 2747 } 2748 2749 return commit; 2750 } 2751 2752 /* Called to commit link state changes noted by inspection step of 2753 * active-backup mode ARP monitor. 2754 * 2755 * Called with RTNL hold. 2756 */ 2757 static void bond_ab_arp_commit(struct bonding *bond) 2758 { 2759 unsigned long trans_start; 2760 struct list_head *iter; 2761 struct slave *slave; 2762 2763 bond_for_each_slave(bond, slave, iter) { 2764 switch (slave->new_link) { 2765 case BOND_LINK_NOCHANGE: 2766 continue; 2767 2768 case BOND_LINK_UP: 2769 trans_start = dev_trans_start(slave->dev); 2770 if (rtnl_dereference(bond->curr_active_slave) != slave || 2771 (!rtnl_dereference(bond->curr_active_slave) && 2772 bond_time_in_interval(bond, trans_start, 1))) { 2773 struct slave *current_arp_slave; 2774 2775 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 2776 bond_set_slave_link_state(slave, BOND_LINK_UP, 2777 BOND_SLAVE_NOTIFY_NOW); 2778 if (current_arp_slave) { 2779 bond_set_slave_inactive_flags( 2780 current_arp_slave, 2781 BOND_SLAVE_NOTIFY_NOW); 2782 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2783 } 2784 2785 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2786 slave->dev->name); 2787 2788 if (!rtnl_dereference(bond->curr_active_slave) || 2789 slave == rtnl_dereference(bond->primary_slave)) 2790 goto do_failover; 2791 2792 } 2793 2794 continue; 2795 2796 case BOND_LINK_DOWN: 2797 if (slave->link_failure_count < UINT_MAX) 2798 slave->link_failure_count++; 2799 2800 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2801 BOND_SLAVE_NOTIFY_NOW); 2802 bond_set_slave_inactive_flags(slave, 2803 BOND_SLAVE_NOTIFY_NOW); 2804 2805 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2806 slave->dev->name); 2807 2808 if (slave == rtnl_dereference(bond->curr_active_slave)) { 2809 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2810 goto do_failover; 2811 } 2812 2813 continue; 2814 2815 default: 2816 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n", 2817 slave->new_link, slave->dev->name); 2818 continue; 2819 } 2820 2821 do_failover: 2822 block_netpoll_tx(); 2823 bond_select_active_slave(bond); 2824 unblock_netpoll_tx(); 2825 } 2826 2827 bond_set_carrier(bond); 2828 } 2829 2830 /* Send ARP probes for active-backup mode ARP monitor. 2831 * 2832 * Called with rcu_read_lock held. 2833 */ 2834 static bool bond_ab_arp_probe(struct bonding *bond) 2835 { 2836 struct slave *slave, *before = NULL, *new_slave = NULL, 2837 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 2838 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 2839 struct list_head *iter; 2840 bool found = false; 2841 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 2842 2843 if (curr_arp_slave && curr_active_slave) 2844 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 2845 curr_arp_slave->dev->name, 2846 curr_active_slave->dev->name); 2847 2848 if (curr_active_slave) { 2849 bond_arp_send_all(bond, curr_active_slave); 2850 return should_notify_rtnl; 2851 } 2852 2853 /* if we don't have a curr_active_slave, search for the next available 2854 * backup slave from the current_arp_slave and make it the candidate 2855 * for becoming the curr_active_slave 2856 */ 2857 2858 if (!curr_arp_slave) { 2859 curr_arp_slave = bond_first_slave_rcu(bond); 2860 if (!curr_arp_slave) 2861 return should_notify_rtnl; 2862 } 2863 2864 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER); 2865 2866 bond_for_each_slave_rcu(bond, slave, iter) { 2867 if (!found && !before && bond_slave_is_up(slave)) 2868 before = slave; 2869 2870 if (found && !new_slave && bond_slave_is_up(slave)) 2871 new_slave = slave; 2872 /* if the link state is up at this point, we 2873 * mark it down - this can happen if we have 2874 * simultaneous link failures and 2875 * reselect_active_interface doesn't make this 2876 * one the current slave so it is still marked 2877 * up when it is actually down 2878 */ 2879 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 2880 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2881 BOND_SLAVE_NOTIFY_LATER); 2882 if (slave->link_failure_count < UINT_MAX) 2883 slave->link_failure_count++; 2884 2885 bond_set_slave_inactive_flags(slave, 2886 BOND_SLAVE_NOTIFY_LATER); 2887 2888 netdev_info(bond->dev, "backup interface %s is now down\n", 2889 slave->dev->name); 2890 } 2891 if (slave == curr_arp_slave) 2892 found = true; 2893 } 2894 2895 if (!new_slave && before) 2896 new_slave = before; 2897 2898 if (!new_slave) 2899 goto check_state; 2900 2901 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 2902 BOND_SLAVE_NOTIFY_LATER); 2903 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 2904 bond_arp_send_all(bond, new_slave); 2905 new_slave->last_link_up = jiffies; 2906 rcu_assign_pointer(bond->current_arp_slave, new_slave); 2907 2908 check_state: 2909 bond_for_each_slave_rcu(bond, slave, iter) { 2910 if (slave->should_notify || slave->should_notify_link) { 2911 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 2912 break; 2913 } 2914 } 2915 return should_notify_rtnl; 2916 } 2917 2918 static void bond_activebackup_arp_mon(struct work_struct *work) 2919 { 2920 struct bonding *bond = container_of(work, struct bonding, 2921 arp_work.work); 2922 bool should_notify_peers = false; 2923 bool should_notify_rtnl = false; 2924 int delta_in_ticks; 2925 2926 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2927 2928 if (!bond_has_slaves(bond)) 2929 goto re_arm; 2930 2931 rcu_read_lock(); 2932 2933 should_notify_peers = bond_should_notify_peers(bond); 2934 2935 if (bond_ab_arp_inspect(bond)) { 2936 rcu_read_unlock(); 2937 2938 /* Race avoidance with bond_close flush of workqueue */ 2939 if (!rtnl_trylock()) { 2940 delta_in_ticks = 1; 2941 should_notify_peers = false; 2942 goto re_arm; 2943 } 2944 2945 bond_ab_arp_commit(bond); 2946 2947 rtnl_unlock(); 2948 rcu_read_lock(); 2949 } 2950 2951 should_notify_rtnl = bond_ab_arp_probe(bond); 2952 rcu_read_unlock(); 2953 2954 re_arm: 2955 if (bond->params.arp_interval) 2956 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2957 2958 if (should_notify_peers || should_notify_rtnl) { 2959 if (!rtnl_trylock()) 2960 return; 2961 2962 if (should_notify_peers) 2963 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 2964 bond->dev); 2965 if (should_notify_rtnl) { 2966 bond_slave_state_notify(bond); 2967 bond_slave_link_notify(bond); 2968 } 2969 2970 rtnl_unlock(); 2971 } 2972 } 2973 2974 /*-------------------------- netdev event handling --------------------------*/ 2975 2976 /* Change device name */ 2977 static int bond_event_changename(struct bonding *bond) 2978 { 2979 bond_remove_proc_entry(bond); 2980 bond_create_proc_entry(bond); 2981 2982 bond_debug_reregister(bond); 2983 2984 return NOTIFY_DONE; 2985 } 2986 2987 static int bond_master_netdev_event(unsigned long event, 2988 struct net_device *bond_dev) 2989 { 2990 struct bonding *event_bond = netdev_priv(bond_dev); 2991 2992 switch (event) { 2993 case NETDEV_CHANGENAME: 2994 return bond_event_changename(event_bond); 2995 case NETDEV_UNREGISTER: 2996 bond_remove_proc_entry(event_bond); 2997 break; 2998 case NETDEV_REGISTER: 2999 bond_create_proc_entry(event_bond); 3000 break; 3001 case NETDEV_NOTIFY_PEERS: 3002 if (event_bond->send_peer_notif) 3003 event_bond->send_peer_notif--; 3004 break; 3005 default: 3006 break; 3007 } 3008 3009 return NOTIFY_DONE; 3010 } 3011 3012 static int bond_slave_netdev_event(unsigned long event, 3013 struct net_device *slave_dev) 3014 { 3015 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 3016 struct bonding *bond; 3017 struct net_device *bond_dev; 3018 3019 /* A netdev event can be generated while enslaving a device 3020 * before netdev_rx_handler_register is called in which case 3021 * slave will be NULL 3022 */ 3023 if (!slave) 3024 return NOTIFY_DONE; 3025 bond_dev = slave->bond->dev; 3026 bond = slave->bond; 3027 primary = rtnl_dereference(bond->primary_slave); 3028 3029 switch (event) { 3030 case NETDEV_UNREGISTER: 3031 if (bond_dev->type != ARPHRD_ETHER) 3032 bond_release_and_destroy(bond_dev, slave_dev); 3033 else 3034 bond_release(bond_dev, slave_dev); 3035 break; 3036 case NETDEV_UP: 3037 case NETDEV_CHANGE: 3038 bond_update_speed_duplex(slave); 3039 if (BOND_MODE(bond) == BOND_MODE_8023AD) 3040 bond_3ad_adapter_speed_duplex_changed(slave); 3041 /* Fallthrough */ 3042 case NETDEV_DOWN: 3043 /* Refresh slave-array if applicable! 3044 * If the setup does not use miimon or arpmon (mode-specific!), 3045 * then these events will not cause the slave-array to be 3046 * refreshed. This will cause xmit to use a slave that is not 3047 * usable. Avoid such situation by refeshing the array at these 3048 * events. If these (miimon/arpmon) parameters are configured 3049 * then array gets refreshed twice and that should be fine! 3050 */ 3051 if (bond_mode_uses_xmit_hash(bond)) 3052 bond_update_slave_arr(bond, NULL); 3053 break; 3054 case NETDEV_CHANGEMTU: 3055 /* TODO: Should slaves be allowed to 3056 * independently alter their MTU? For 3057 * an active-backup bond, slaves need 3058 * not be the same type of device, so 3059 * MTUs may vary. For other modes, 3060 * slaves arguably should have the 3061 * same MTUs. To do this, we'd need to 3062 * take over the slave's change_mtu 3063 * function for the duration of their 3064 * servitude. 3065 */ 3066 break; 3067 case NETDEV_CHANGENAME: 3068 /* we don't care if we don't have primary set */ 3069 if (!bond_uses_primary(bond) || 3070 !bond->params.primary[0]) 3071 break; 3072 3073 if (slave == primary) { 3074 /* slave's name changed - he's no longer primary */ 3075 RCU_INIT_POINTER(bond->primary_slave, NULL); 3076 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3077 /* we have a new primary slave */ 3078 rcu_assign_pointer(bond->primary_slave, slave); 3079 } else { /* we didn't change primary - exit */ 3080 break; 3081 } 3082 3083 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3084 primary ? slave_dev->name : "none"); 3085 3086 block_netpoll_tx(); 3087 bond_select_active_slave(bond); 3088 unblock_netpoll_tx(); 3089 break; 3090 case NETDEV_FEAT_CHANGE: 3091 bond_compute_features(bond); 3092 break; 3093 case NETDEV_RESEND_IGMP: 3094 /* Propagate to master device */ 3095 call_netdevice_notifiers(event, slave->bond->dev); 3096 break; 3097 default: 3098 break; 3099 } 3100 3101 return NOTIFY_DONE; 3102 } 3103 3104 /* bond_netdev_event: handle netdev notifier chain events. 3105 * 3106 * This function receives events for the netdev chain. The caller (an 3107 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3108 * locks for us to safely manipulate the slave devices (RTNL lock, 3109 * dev_probe_lock). 3110 */ 3111 static int bond_netdev_event(struct notifier_block *this, 3112 unsigned long event, void *ptr) 3113 { 3114 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3115 3116 netdev_dbg(event_dev, "event: %lx\n", event); 3117 3118 if (!(event_dev->priv_flags & IFF_BONDING)) 3119 return NOTIFY_DONE; 3120 3121 if (event_dev->flags & IFF_MASTER) { 3122 netdev_dbg(event_dev, "IFF_MASTER\n"); 3123 return bond_master_netdev_event(event, event_dev); 3124 } 3125 3126 if (event_dev->flags & IFF_SLAVE) { 3127 netdev_dbg(event_dev, "IFF_SLAVE\n"); 3128 return bond_slave_netdev_event(event, event_dev); 3129 } 3130 3131 return NOTIFY_DONE; 3132 } 3133 3134 static struct notifier_block bond_netdev_notifier = { 3135 .notifier_call = bond_netdev_event, 3136 }; 3137 3138 /*---------------------------- Hashing Policies -----------------------------*/ 3139 3140 /* L2 hash helper */ 3141 static inline u32 bond_eth_hash(struct sk_buff *skb) 3142 { 3143 struct ethhdr *ep, hdr_tmp; 3144 3145 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp); 3146 if (ep) 3147 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto; 3148 return 0; 3149 } 3150 3151 /* Extract the appropriate headers based on bond's xmit policy */ 3152 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, 3153 struct flow_keys *fk) 3154 { 3155 const struct ipv6hdr *iph6; 3156 const struct iphdr *iph; 3157 int noff, proto = -1; 3158 3159 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) 3160 return skb_flow_dissect_flow_keys(skb, fk, 0); 3161 3162 fk->ports.ports = 0; 3163 noff = skb_network_offset(skb); 3164 if (skb->protocol == htons(ETH_P_IP)) { 3165 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 3166 return false; 3167 iph = ip_hdr(skb); 3168 iph_to_flow_copy_v4addrs(fk, iph); 3169 noff += iph->ihl << 2; 3170 if (!ip_is_fragment(iph)) 3171 proto = iph->protocol; 3172 } else if (skb->protocol == htons(ETH_P_IPV6)) { 3173 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6)))) 3174 return false; 3175 iph6 = ipv6_hdr(skb); 3176 iph_to_flow_copy_v6addrs(fk, iph6); 3177 noff += sizeof(*iph6); 3178 proto = iph6->nexthdr; 3179 } else { 3180 return false; 3181 } 3182 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0) 3183 fk->ports.ports = skb_flow_get_ports(skb, noff, proto); 3184 3185 return true; 3186 } 3187 3188 /** 3189 * bond_xmit_hash - generate a hash value based on the xmit policy 3190 * @bond: bonding device 3191 * @skb: buffer to use for headers 3192 * 3193 * This function will extract the necessary headers from the skb buffer and use 3194 * them to generate a hash based on the xmit_policy set in the bonding device 3195 */ 3196 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 3197 { 3198 struct flow_keys flow; 3199 u32 hash; 3200 3201 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 3202 skb->l4_hash) 3203 return skb->hash; 3204 3205 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 3206 !bond_flow_dissect(bond, skb, &flow)) 3207 return bond_eth_hash(skb); 3208 3209 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 3210 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) 3211 hash = bond_eth_hash(skb); 3212 else 3213 hash = (__force u32)flow.ports.ports; 3214 hash ^= (__force u32)flow_get_u32_dst(&flow) ^ 3215 (__force u32)flow_get_u32_src(&flow); 3216 hash ^= (hash >> 16); 3217 hash ^= (hash >> 8); 3218 3219 return hash; 3220 } 3221 3222 /*-------------------------- Device entry points ----------------------------*/ 3223 3224 static void bond_work_init_all(struct bonding *bond) 3225 { 3226 INIT_DELAYED_WORK(&bond->mcast_work, 3227 bond_resend_igmp_join_requests_delayed); 3228 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3229 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3230 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3231 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon); 3232 else 3233 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon); 3234 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3235 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 3236 } 3237 3238 static void bond_work_cancel_all(struct bonding *bond) 3239 { 3240 cancel_delayed_work_sync(&bond->mii_work); 3241 cancel_delayed_work_sync(&bond->arp_work); 3242 cancel_delayed_work_sync(&bond->alb_work); 3243 cancel_delayed_work_sync(&bond->ad_work); 3244 cancel_delayed_work_sync(&bond->mcast_work); 3245 cancel_delayed_work_sync(&bond->slave_arr_work); 3246 } 3247 3248 static int bond_open(struct net_device *bond_dev) 3249 { 3250 struct bonding *bond = netdev_priv(bond_dev); 3251 struct list_head *iter; 3252 struct slave *slave; 3253 3254 /* reset slave->backup and slave->inactive */ 3255 if (bond_has_slaves(bond)) { 3256 bond_for_each_slave(bond, slave, iter) { 3257 if (bond_uses_primary(bond) && 3258 slave != rcu_access_pointer(bond->curr_active_slave)) { 3259 bond_set_slave_inactive_flags(slave, 3260 BOND_SLAVE_NOTIFY_NOW); 3261 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 3262 bond_set_slave_active_flags(slave, 3263 BOND_SLAVE_NOTIFY_NOW); 3264 } 3265 } 3266 } 3267 3268 bond_work_init_all(bond); 3269 3270 if (bond_is_lb(bond)) { 3271 /* bond_alb_initialize must be called before the timer 3272 * is started. 3273 */ 3274 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 3275 return -ENOMEM; 3276 if (bond->params.tlb_dynamic_lb) 3277 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3278 } 3279 3280 if (bond->params.miimon) /* link check interval, in milliseconds. */ 3281 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3282 3283 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3284 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3285 bond->recv_probe = bond_arp_rcv; 3286 } 3287 3288 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3289 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3290 /* register to receive LACPDUs */ 3291 bond->recv_probe = bond_3ad_lacpdu_recv; 3292 bond_3ad_initiate_agg_selection(bond, 1); 3293 } 3294 3295 if (bond_mode_uses_xmit_hash(bond)) 3296 bond_update_slave_arr(bond, NULL); 3297 3298 return 0; 3299 } 3300 3301 static int bond_close(struct net_device *bond_dev) 3302 { 3303 struct bonding *bond = netdev_priv(bond_dev); 3304 3305 bond_work_cancel_all(bond); 3306 bond->send_peer_notif = 0; 3307 if (bond_is_lb(bond)) 3308 bond_alb_deinitialize(bond); 3309 bond->recv_probe = NULL; 3310 3311 return 0; 3312 } 3313 3314 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 3315 * that some drivers can provide 32bit values only. 3316 */ 3317 static void bond_fold_stats(struct rtnl_link_stats64 *_res, 3318 const struct rtnl_link_stats64 *_new, 3319 const struct rtnl_link_stats64 *_old) 3320 { 3321 const u64 *new = (const u64 *)_new; 3322 const u64 *old = (const u64 *)_old; 3323 u64 *res = (u64 *)_res; 3324 int i; 3325 3326 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 3327 u64 nv = new[i]; 3328 u64 ov = old[i]; 3329 3330 /* detects if this particular field is 32bit only */ 3331 if (((nv | ov) >> 32) == 0) 3332 res[i] += (u32)nv - (u32)ov; 3333 else 3334 res[i] += nv - ov; 3335 } 3336 } 3337 3338 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 3339 struct rtnl_link_stats64 *stats) 3340 { 3341 struct bonding *bond = netdev_priv(bond_dev); 3342 struct rtnl_link_stats64 temp; 3343 struct list_head *iter; 3344 struct slave *slave; 3345 3346 spin_lock(&bond->stats_lock); 3347 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 3348 3349 rcu_read_lock(); 3350 bond_for_each_slave_rcu(bond, slave, iter) { 3351 const struct rtnl_link_stats64 *new = 3352 dev_get_stats(slave->dev, &temp); 3353 3354 bond_fold_stats(stats, new, &slave->slave_stats); 3355 3356 /* save off the slave stats for the next run */ 3357 memcpy(&slave->slave_stats, new, sizeof(*new)); 3358 } 3359 rcu_read_unlock(); 3360 3361 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 3362 spin_unlock(&bond->stats_lock); 3363 3364 return stats; 3365 } 3366 3367 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3368 { 3369 struct bonding *bond = netdev_priv(bond_dev); 3370 struct net_device *slave_dev = NULL; 3371 struct ifbond k_binfo; 3372 struct ifbond __user *u_binfo = NULL; 3373 struct ifslave k_sinfo; 3374 struct ifslave __user *u_sinfo = NULL; 3375 struct mii_ioctl_data *mii = NULL; 3376 struct bond_opt_value newval; 3377 struct net *net; 3378 int res = 0; 3379 3380 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 3381 3382 switch (cmd) { 3383 case SIOCGMIIPHY: 3384 mii = if_mii(ifr); 3385 if (!mii) 3386 return -EINVAL; 3387 3388 mii->phy_id = 0; 3389 /* Fall Through */ 3390 case SIOCGMIIREG: 3391 /* We do this again just in case we were called by SIOCGMIIREG 3392 * instead of SIOCGMIIPHY. 3393 */ 3394 mii = if_mii(ifr); 3395 if (!mii) 3396 return -EINVAL; 3397 3398 if (mii->reg_num == 1) { 3399 mii->val_out = 0; 3400 if (netif_carrier_ok(bond->dev)) 3401 mii->val_out = BMSR_LSTATUS; 3402 } 3403 3404 return 0; 3405 case BOND_INFO_QUERY_OLD: 3406 case SIOCBONDINFOQUERY: 3407 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3408 3409 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3410 return -EFAULT; 3411 3412 res = bond_info_query(bond_dev, &k_binfo); 3413 if (res == 0 && 3414 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3415 return -EFAULT; 3416 3417 return res; 3418 case BOND_SLAVE_INFO_QUERY_OLD: 3419 case SIOCBONDSLAVEINFOQUERY: 3420 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3421 3422 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3423 return -EFAULT; 3424 3425 res = bond_slave_info_query(bond_dev, &k_sinfo); 3426 if (res == 0 && 3427 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3428 return -EFAULT; 3429 3430 return res; 3431 default: 3432 break; 3433 } 3434 3435 net = dev_net(bond_dev); 3436 3437 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3438 return -EPERM; 3439 3440 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 3441 3442 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev); 3443 3444 if (!slave_dev) 3445 return -ENODEV; 3446 3447 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name); 3448 switch (cmd) { 3449 case BOND_ENSLAVE_OLD: 3450 case SIOCBONDENSLAVE: 3451 res = bond_enslave(bond_dev, slave_dev); 3452 break; 3453 case BOND_RELEASE_OLD: 3454 case SIOCBONDRELEASE: 3455 res = bond_release(bond_dev, slave_dev); 3456 break; 3457 case BOND_SETHWADDR_OLD: 3458 case SIOCBONDSETHWADDR: 3459 bond_set_dev_addr(bond_dev, slave_dev); 3460 res = 0; 3461 break; 3462 case BOND_CHANGE_ACTIVE_OLD: 3463 case SIOCBONDCHANGEACTIVE: 3464 bond_opt_initstr(&newval, slave_dev->name); 3465 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval); 3466 break; 3467 default: 3468 res = -EOPNOTSUPP; 3469 } 3470 3471 return res; 3472 } 3473 3474 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 3475 { 3476 struct bonding *bond = netdev_priv(bond_dev); 3477 3478 if (change & IFF_PROMISC) 3479 bond_set_promiscuity(bond, 3480 bond_dev->flags & IFF_PROMISC ? 1 : -1); 3481 3482 if (change & IFF_ALLMULTI) 3483 bond_set_allmulti(bond, 3484 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 3485 } 3486 3487 static void bond_set_rx_mode(struct net_device *bond_dev) 3488 { 3489 struct bonding *bond = netdev_priv(bond_dev); 3490 struct list_head *iter; 3491 struct slave *slave; 3492 3493 rcu_read_lock(); 3494 if (bond_uses_primary(bond)) { 3495 slave = rcu_dereference(bond->curr_active_slave); 3496 if (slave) { 3497 dev_uc_sync(slave->dev, bond_dev); 3498 dev_mc_sync(slave->dev, bond_dev); 3499 } 3500 } else { 3501 bond_for_each_slave_rcu(bond, slave, iter) { 3502 dev_uc_sync_multiple(slave->dev, bond_dev); 3503 dev_mc_sync_multiple(slave->dev, bond_dev); 3504 } 3505 } 3506 rcu_read_unlock(); 3507 } 3508 3509 static int bond_neigh_init(struct neighbour *n) 3510 { 3511 struct bonding *bond = netdev_priv(n->dev); 3512 const struct net_device_ops *slave_ops; 3513 struct neigh_parms parms; 3514 struct slave *slave; 3515 int ret; 3516 3517 slave = bond_first_slave(bond); 3518 if (!slave) 3519 return 0; 3520 slave_ops = slave->dev->netdev_ops; 3521 if (!slave_ops->ndo_neigh_setup) 3522 return 0; 3523 3524 parms.neigh_setup = NULL; 3525 parms.neigh_cleanup = NULL; 3526 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 3527 if (ret) 3528 return ret; 3529 3530 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called 3531 * after the last slave has been detached. Assumes that all slaves 3532 * utilize the same neigh_cleanup (true at this writing as only user 3533 * is ipoib). 3534 */ 3535 n->parms->neigh_cleanup = parms.neigh_cleanup; 3536 3537 if (!parms.neigh_setup) 3538 return 0; 3539 3540 return parms.neigh_setup(n); 3541 } 3542 3543 /* The bonding ndo_neigh_setup is called at init time beofre any 3544 * slave exists. So we must declare proxy setup function which will 3545 * be used at run time to resolve the actual slave neigh param setup. 3546 * 3547 * It's also called by master devices (such as vlans) to setup their 3548 * underlying devices. In that case - do nothing, we're already set up from 3549 * our init. 3550 */ 3551 static int bond_neigh_setup(struct net_device *dev, 3552 struct neigh_parms *parms) 3553 { 3554 /* modify only our neigh_parms */ 3555 if (parms->dev == dev) 3556 parms->neigh_setup = bond_neigh_init; 3557 3558 return 0; 3559 } 3560 3561 /* Change the MTU of all of a master's slaves to match the master */ 3562 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3563 { 3564 struct bonding *bond = netdev_priv(bond_dev); 3565 struct slave *slave, *rollback_slave; 3566 struct list_head *iter; 3567 int res = 0; 3568 3569 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 3570 3571 bond_for_each_slave(bond, slave, iter) { 3572 netdev_dbg(bond_dev, "s %p c_m %p\n", 3573 slave, slave->dev->netdev_ops->ndo_change_mtu); 3574 3575 res = dev_set_mtu(slave->dev, new_mtu); 3576 3577 if (res) { 3578 /* If we failed to set the slave's mtu to the new value 3579 * we must abort the operation even in ACTIVE_BACKUP 3580 * mode, because if we allow the backup slaves to have 3581 * different mtu values than the active slave we'll 3582 * need to change their mtu when doing a failover. That 3583 * means changing their mtu from timer context, which 3584 * is probably not a good idea. 3585 */ 3586 netdev_dbg(bond_dev, "err %d %s\n", res, 3587 slave->dev->name); 3588 goto unwind; 3589 } 3590 } 3591 3592 bond_dev->mtu = new_mtu; 3593 3594 return 0; 3595 3596 unwind: 3597 /* unwind from head to the slave that failed */ 3598 bond_for_each_slave(bond, rollback_slave, iter) { 3599 int tmp_res; 3600 3601 if (rollback_slave == slave) 3602 break; 3603 3604 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 3605 if (tmp_res) { 3606 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3607 tmp_res, rollback_slave->dev->name); 3608 } 3609 } 3610 3611 return res; 3612 } 3613 3614 /* Change HW address 3615 * 3616 * Note that many devices must be down to change the HW address, and 3617 * downing the master releases all slaves. We can make bonds full of 3618 * bonding devices to test this, however. 3619 */ 3620 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3621 { 3622 struct bonding *bond = netdev_priv(bond_dev); 3623 struct slave *slave, *rollback_slave; 3624 struct sockaddr *sa = addr, tmp_sa; 3625 struct list_head *iter; 3626 int res = 0; 3627 3628 if (BOND_MODE(bond) == BOND_MODE_ALB) 3629 return bond_alb_set_mac_address(bond_dev, addr); 3630 3631 3632 netdev_dbg(bond_dev, "bond=%p\n", bond); 3633 3634 /* If fail_over_mac is enabled, do nothing and return success. 3635 * Returning an error causes ifenslave to fail. 3636 */ 3637 if (bond->params.fail_over_mac && 3638 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3639 return 0; 3640 3641 if (!is_valid_ether_addr(sa->sa_data)) 3642 return -EADDRNOTAVAIL; 3643 3644 bond_for_each_slave(bond, slave, iter) { 3645 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name); 3646 res = dev_set_mac_address(slave->dev, addr); 3647 if (res) { 3648 /* TODO: consider downing the slave 3649 * and retry ? 3650 * User should expect communications 3651 * breakage anyway until ARP finish 3652 * updating, so... 3653 */ 3654 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name); 3655 goto unwind; 3656 } 3657 } 3658 3659 /* success */ 3660 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); 3661 return 0; 3662 3663 unwind: 3664 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 3665 tmp_sa.sa_family = bond_dev->type; 3666 3667 /* unwind from head to the slave that failed */ 3668 bond_for_each_slave(bond, rollback_slave, iter) { 3669 int tmp_res; 3670 3671 if (rollback_slave == slave) 3672 break; 3673 3674 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa); 3675 if (tmp_res) { 3676 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3677 tmp_res, rollback_slave->dev->name); 3678 } 3679 } 3680 3681 return res; 3682 } 3683 3684 /** 3685 * bond_xmit_slave_id - transmit skb through slave with slave_id 3686 * @bond: bonding device that is transmitting 3687 * @skb: buffer to transmit 3688 * @slave_id: slave id up to slave_cnt-1 through which to transmit 3689 * 3690 * This function tries to transmit through slave with slave_id but in case 3691 * it fails, it tries to find the first available slave for transmission. 3692 * The skb is consumed in all cases, thus the function is void. 3693 */ 3694 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id) 3695 { 3696 struct list_head *iter; 3697 struct slave *slave; 3698 int i = slave_id; 3699 3700 /* Here we start from the slave with slave_id */ 3701 bond_for_each_slave_rcu(bond, slave, iter) { 3702 if (--i < 0) { 3703 if (bond_slave_can_tx(slave)) { 3704 bond_dev_queue_xmit(bond, skb, slave->dev); 3705 return; 3706 } 3707 } 3708 } 3709 3710 /* Here we start from the first slave up to slave_id */ 3711 i = slave_id; 3712 bond_for_each_slave_rcu(bond, slave, iter) { 3713 if (--i < 0) 3714 break; 3715 if (bond_slave_can_tx(slave)) { 3716 bond_dev_queue_xmit(bond, skb, slave->dev); 3717 return; 3718 } 3719 } 3720 /* no slave that can tx has been found */ 3721 bond_tx_drop(bond->dev, skb); 3722 } 3723 3724 /** 3725 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 3726 * @bond: bonding device to use 3727 * 3728 * Based on the value of the bonding device's packets_per_slave parameter 3729 * this function generates a slave id, which is usually used as the next 3730 * slave to transmit through. 3731 */ 3732 static u32 bond_rr_gen_slave_id(struct bonding *bond) 3733 { 3734 u32 slave_id; 3735 struct reciprocal_value reciprocal_packets_per_slave; 3736 int packets_per_slave = bond->params.packets_per_slave; 3737 3738 switch (packets_per_slave) { 3739 case 0: 3740 slave_id = prandom_u32(); 3741 break; 3742 case 1: 3743 slave_id = bond->rr_tx_counter; 3744 break; 3745 default: 3746 reciprocal_packets_per_slave = 3747 bond->params.reciprocal_packets_per_slave; 3748 slave_id = reciprocal_divide(bond->rr_tx_counter, 3749 reciprocal_packets_per_slave); 3750 break; 3751 } 3752 bond->rr_tx_counter++; 3753 3754 return slave_id; 3755 } 3756 3757 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3758 { 3759 struct bonding *bond = netdev_priv(bond_dev); 3760 struct iphdr *iph = ip_hdr(skb); 3761 struct slave *slave; 3762 u32 slave_id; 3763 3764 /* Start with the curr_active_slave that joined the bond as the 3765 * default for sending IGMP traffic. For failover purposes one 3766 * needs to maintain some consistency for the interface that will 3767 * send the join/membership reports. The curr_active_slave found 3768 * will send all of this type of traffic. 3769 */ 3770 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) { 3771 slave = rcu_dereference(bond->curr_active_slave); 3772 if (slave) 3773 bond_dev_queue_xmit(bond, skb, slave->dev); 3774 else 3775 bond_xmit_slave_id(bond, skb, 0); 3776 } else { 3777 int slave_cnt = ACCESS_ONCE(bond->slave_cnt); 3778 3779 if (likely(slave_cnt)) { 3780 slave_id = bond_rr_gen_slave_id(bond); 3781 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt); 3782 } else { 3783 bond_tx_drop(bond_dev, skb); 3784 } 3785 } 3786 3787 return NETDEV_TX_OK; 3788 } 3789 3790 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 3791 * the bond has a usable interface. 3792 */ 3793 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 3794 { 3795 struct bonding *bond = netdev_priv(bond_dev); 3796 struct slave *slave; 3797 3798 slave = rcu_dereference(bond->curr_active_slave); 3799 if (slave) 3800 bond_dev_queue_xmit(bond, skb, slave->dev); 3801 else 3802 bond_tx_drop(bond_dev, skb); 3803 3804 return NETDEV_TX_OK; 3805 } 3806 3807 /* Use this to update slave_array when (a) it's not appropriate to update 3808 * slave_array right away (note that update_slave_array() may sleep) 3809 * and / or (b) RTNL is not held. 3810 */ 3811 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 3812 { 3813 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 3814 } 3815 3816 /* Slave array work handler. Holds only RTNL */ 3817 static void bond_slave_arr_handler(struct work_struct *work) 3818 { 3819 struct bonding *bond = container_of(work, struct bonding, 3820 slave_arr_work.work); 3821 int ret; 3822 3823 if (!rtnl_trylock()) 3824 goto err; 3825 3826 ret = bond_update_slave_arr(bond, NULL); 3827 rtnl_unlock(); 3828 if (ret) { 3829 pr_warn_ratelimited("Failed to update slave array from WT\n"); 3830 goto err; 3831 } 3832 return; 3833 3834 err: 3835 bond_slave_arr_work_rearm(bond, 1); 3836 } 3837 3838 /* Build the usable slaves array in control path for modes that use xmit-hash 3839 * to determine the slave interface - 3840 * (a) BOND_MODE_8023AD 3841 * (b) BOND_MODE_XOR 3842 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0 3843 * 3844 * The caller is expected to hold RTNL only and NO other lock! 3845 */ 3846 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 3847 { 3848 struct slave *slave; 3849 struct list_head *iter; 3850 struct bond_up_slave *new_arr, *old_arr; 3851 int agg_id = 0; 3852 int ret = 0; 3853 3854 #ifdef CONFIG_LOCKDEP 3855 WARN_ON(lockdep_is_held(&bond->mode_lock)); 3856 #endif 3857 3858 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]), 3859 GFP_KERNEL); 3860 if (!new_arr) { 3861 ret = -ENOMEM; 3862 pr_err("Failed to build slave-array.\n"); 3863 goto out; 3864 } 3865 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3866 struct ad_info ad_info; 3867 3868 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 3869 pr_debug("bond_3ad_get_active_agg_info failed\n"); 3870 kfree_rcu(new_arr, rcu); 3871 /* No active aggragator means it's not safe to use 3872 * the previous array. 3873 */ 3874 old_arr = rtnl_dereference(bond->slave_arr); 3875 if (old_arr) { 3876 RCU_INIT_POINTER(bond->slave_arr, NULL); 3877 kfree_rcu(old_arr, rcu); 3878 } 3879 goto out; 3880 } 3881 agg_id = ad_info.aggregator_id; 3882 } 3883 bond_for_each_slave(bond, slave, iter) { 3884 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3885 struct aggregator *agg; 3886 3887 agg = SLAVE_AD_INFO(slave)->port.aggregator; 3888 if (!agg || agg->aggregator_identifier != agg_id) 3889 continue; 3890 } 3891 if (!bond_slave_can_tx(slave)) 3892 continue; 3893 if (skipslave == slave) 3894 continue; 3895 new_arr->arr[new_arr->count++] = slave; 3896 } 3897 3898 old_arr = rtnl_dereference(bond->slave_arr); 3899 rcu_assign_pointer(bond->slave_arr, new_arr); 3900 if (old_arr) 3901 kfree_rcu(old_arr, rcu); 3902 out: 3903 if (ret != 0 && skipslave) { 3904 int idx; 3905 3906 /* Rare situation where caller has asked to skip a specific 3907 * slave but allocation failed (most likely!). BTW this is 3908 * only possible when the call is initiated from 3909 * __bond_release_one(). In this situation; overwrite the 3910 * skipslave entry in the array with the last entry from the 3911 * array to avoid a situation where the xmit path may choose 3912 * this to-be-skipped slave to send a packet out. 3913 */ 3914 old_arr = rtnl_dereference(bond->slave_arr); 3915 for (idx = 0; idx < old_arr->count; idx++) { 3916 if (skipslave == old_arr->arr[idx]) { 3917 old_arr->arr[idx] = 3918 old_arr->arr[old_arr->count-1]; 3919 old_arr->count--; 3920 break; 3921 } 3922 } 3923 } 3924 return ret; 3925 } 3926 3927 /* Use this Xmit function for 3AD as well as XOR modes. The current 3928 * usable slave array is formed in the control path. The xmit function 3929 * just calculates hash and sends the packet out. 3930 */ 3931 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev) 3932 { 3933 struct bonding *bond = netdev_priv(dev); 3934 struct slave *slave; 3935 struct bond_up_slave *slaves; 3936 unsigned int count; 3937 3938 slaves = rcu_dereference(bond->slave_arr); 3939 count = slaves ? ACCESS_ONCE(slaves->count) : 0; 3940 if (likely(count)) { 3941 slave = slaves->arr[bond_xmit_hash(bond, skb) % count]; 3942 bond_dev_queue_xmit(bond, skb, slave->dev); 3943 } else { 3944 bond_tx_drop(dev, skb); 3945 } 3946 3947 return NETDEV_TX_OK; 3948 } 3949 3950 /* in broadcast mode, we send everything to all usable interfaces. */ 3951 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 3952 { 3953 struct bonding *bond = netdev_priv(bond_dev); 3954 struct slave *slave = NULL; 3955 struct list_head *iter; 3956 3957 bond_for_each_slave_rcu(bond, slave, iter) { 3958 if (bond_is_last_slave(bond, slave)) 3959 break; 3960 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3961 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 3962 3963 if (!skb2) { 3964 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 3965 bond_dev->name, __func__); 3966 continue; 3967 } 3968 bond_dev_queue_xmit(bond, skb2, slave->dev); 3969 } 3970 } 3971 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) 3972 bond_dev_queue_xmit(bond, skb, slave->dev); 3973 else 3974 bond_tx_drop(bond_dev, skb); 3975 3976 return NETDEV_TX_OK; 3977 } 3978 3979 /*------------------------- Device initialization ---------------------------*/ 3980 3981 /* Lookup the slave that corresponds to a qid */ 3982 static inline int bond_slave_override(struct bonding *bond, 3983 struct sk_buff *skb) 3984 { 3985 struct slave *slave = NULL; 3986 struct list_head *iter; 3987 3988 if (!skb->queue_mapping) 3989 return 1; 3990 3991 /* Find out if any slaves have the same mapping as this skb. */ 3992 bond_for_each_slave_rcu(bond, slave, iter) { 3993 if (slave->queue_id == skb->queue_mapping) { 3994 if (bond_slave_is_up(slave) && 3995 slave->link == BOND_LINK_UP) { 3996 bond_dev_queue_xmit(bond, skb, slave->dev); 3997 return 0; 3998 } 3999 /* If the slave isn't UP, use default transmit policy. */ 4000 break; 4001 } 4002 } 4003 4004 return 1; 4005 } 4006 4007 4008 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 4009 void *accel_priv, select_queue_fallback_t fallback) 4010 { 4011 /* This helper function exists to help dev_pick_tx get the correct 4012 * destination queue. Using a helper function skips a call to 4013 * skb_tx_hash and will put the skbs in the queue we expect on their 4014 * way down to the bonding driver. 4015 */ 4016 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 4017 4018 /* Save the original txq to restore before passing to the driver */ 4019 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping; 4020 4021 if (unlikely(txq >= dev->real_num_tx_queues)) { 4022 do { 4023 txq -= dev->real_num_tx_queues; 4024 } while (txq >= dev->real_num_tx_queues); 4025 } 4026 return txq; 4027 } 4028 4029 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4030 { 4031 struct bonding *bond = netdev_priv(dev); 4032 4033 if (bond_should_override_tx_queue(bond) && 4034 !bond_slave_override(bond, skb)) 4035 return NETDEV_TX_OK; 4036 4037 switch (BOND_MODE(bond)) { 4038 case BOND_MODE_ROUNDROBIN: 4039 return bond_xmit_roundrobin(skb, dev); 4040 case BOND_MODE_ACTIVEBACKUP: 4041 return bond_xmit_activebackup(skb, dev); 4042 case BOND_MODE_8023AD: 4043 case BOND_MODE_XOR: 4044 return bond_3ad_xor_xmit(skb, dev); 4045 case BOND_MODE_BROADCAST: 4046 return bond_xmit_broadcast(skb, dev); 4047 case BOND_MODE_ALB: 4048 return bond_alb_xmit(skb, dev); 4049 case BOND_MODE_TLB: 4050 return bond_tlb_xmit(skb, dev); 4051 default: 4052 /* Should never happen, mode already checked */ 4053 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 4054 WARN_ON_ONCE(1); 4055 bond_tx_drop(dev, skb); 4056 return NETDEV_TX_OK; 4057 } 4058 } 4059 4060 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4061 { 4062 struct bonding *bond = netdev_priv(dev); 4063 netdev_tx_t ret = NETDEV_TX_OK; 4064 4065 /* If we risk deadlock from transmitting this in the 4066 * netpoll path, tell netpoll to queue the frame for later tx 4067 */ 4068 if (unlikely(is_netpoll_tx_blocked(dev))) 4069 return NETDEV_TX_BUSY; 4070 4071 rcu_read_lock(); 4072 if (bond_has_slaves(bond)) 4073 ret = __bond_start_xmit(skb, dev); 4074 else 4075 bond_tx_drop(dev, skb); 4076 rcu_read_unlock(); 4077 4078 return ret; 4079 } 4080 4081 static int bond_ethtool_get_settings(struct net_device *bond_dev, 4082 struct ethtool_cmd *ecmd) 4083 { 4084 struct bonding *bond = netdev_priv(bond_dev); 4085 unsigned long speed = 0; 4086 struct list_head *iter; 4087 struct slave *slave; 4088 4089 ecmd->duplex = DUPLEX_UNKNOWN; 4090 ecmd->port = PORT_OTHER; 4091 4092 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 4093 * do not need to check mode. Though link speed might not represent 4094 * the true receive or transmit bandwidth (not all modes are symmetric) 4095 * this is an accurate maximum. 4096 */ 4097 bond_for_each_slave(bond, slave, iter) { 4098 if (bond_slave_can_tx(slave)) { 4099 if (slave->speed != SPEED_UNKNOWN) 4100 speed += slave->speed; 4101 if (ecmd->duplex == DUPLEX_UNKNOWN && 4102 slave->duplex != DUPLEX_UNKNOWN) 4103 ecmd->duplex = slave->duplex; 4104 } 4105 } 4106 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN); 4107 4108 return 0; 4109 } 4110 4111 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4112 struct ethtool_drvinfo *drvinfo) 4113 { 4114 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 4115 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version)); 4116 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 4117 BOND_ABI_VERSION); 4118 } 4119 4120 static const struct ethtool_ops bond_ethtool_ops = { 4121 .get_drvinfo = bond_ethtool_get_drvinfo, 4122 .get_settings = bond_ethtool_get_settings, 4123 .get_link = ethtool_op_get_link, 4124 }; 4125 4126 static const struct net_device_ops bond_netdev_ops = { 4127 .ndo_init = bond_init, 4128 .ndo_uninit = bond_uninit, 4129 .ndo_open = bond_open, 4130 .ndo_stop = bond_close, 4131 .ndo_start_xmit = bond_start_xmit, 4132 .ndo_select_queue = bond_select_queue, 4133 .ndo_get_stats64 = bond_get_stats, 4134 .ndo_do_ioctl = bond_do_ioctl, 4135 .ndo_change_rx_flags = bond_change_rx_flags, 4136 .ndo_set_rx_mode = bond_set_rx_mode, 4137 .ndo_change_mtu = bond_change_mtu, 4138 .ndo_set_mac_address = bond_set_mac_address, 4139 .ndo_neigh_setup = bond_neigh_setup, 4140 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4141 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4142 #ifdef CONFIG_NET_POLL_CONTROLLER 4143 .ndo_netpoll_setup = bond_netpoll_setup, 4144 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4145 .ndo_poll_controller = bond_poll_controller, 4146 #endif 4147 .ndo_add_slave = bond_enslave, 4148 .ndo_del_slave = bond_release, 4149 .ndo_fix_features = bond_fix_features, 4150 .ndo_neigh_construct = netdev_default_l2upper_neigh_construct, 4151 .ndo_neigh_destroy = netdev_default_l2upper_neigh_destroy, 4152 .ndo_bridge_setlink = switchdev_port_bridge_setlink, 4153 .ndo_bridge_getlink = switchdev_port_bridge_getlink, 4154 .ndo_bridge_dellink = switchdev_port_bridge_dellink, 4155 .ndo_fdb_add = switchdev_port_fdb_add, 4156 .ndo_fdb_del = switchdev_port_fdb_del, 4157 .ndo_fdb_dump = switchdev_port_fdb_dump, 4158 .ndo_features_check = passthru_features_check, 4159 }; 4160 4161 static const struct device_type bond_type = { 4162 .name = "bond", 4163 }; 4164 4165 static void bond_destructor(struct net_device *bond_dev) 4166 { 4167 struct bonding *bond = netdev_priv(bond_dev); 4168 if (bond->wq) 4169 destroy_workqueue(bond->wq); 4170 free_netdev(bond_dev); 4171 } 4172 4173 void bond_setup(struct net_device *bond_dev) 4174 { 4175 struct bonding *bond = netdev_priv(bond_dev); 4176 4177 spin_lock_init(&bond->mode_lock); 4178 spin_lock_init(&bond->stats_lock); 4179 bond->params = bonding_defaults; 4180 4181 /* Initialize pointers */ 4182 bond->dev = bond_dev; 4183 4184 /* Initialize the device entry points */ 4185 ether_setup(bond_dev); 4186 bond_dev->netdev_ops = &bond_netdev_ops; 4187 bond_dev->ethtool_ops = &bond_ethtool_ops; 4188 4189 bond_dev->destructor = bond_destructor; 4190 4191 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 4192 4193 /* Initialize the device options */ 4194 bond_dev->flags |= IFF_MASTER; 4195 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 4196 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 4197 4198 /* don't acquire bond device's netif_tx_lock when transmitting */ 4199 bond_dev->features |= NETIF_F_LLTX; 4200 4201 /* By default, we declare the bond to be fully 4202 * VLAN hardware accelerated capable. Special 4203 * care is taken in the various xmit functions 4204 * when there are slaves that are not hw accel 4205 * capable 4206 */ 4207 4208 /* Don't allow bond devices to change network namespaces. */ 4209 bond_dev->features |= NETIF_F_NETNS_LOCAL; 4210 4211 bond_dev->hw_features = BOND_VLAN_FEATURES | 4212 NETIF_F_HW_VLAN_CTAG_TX | 4213 NETIF_F_HW_VLAN_CTAG_RX | 4214 NETIF_F_HW_VLAN_CTAG_FILTER; 4215 4216 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 4217 bond_dev->features |= bond_dev->hw_features; 4218 } 4219 4220 /* Destroy a bonding device. 4221 * Must be under rtnl_lock when this function is called. 4222 */ 4223 static void bond_uninit(struct net_device *bond_dev) 4224 { 4225 struct bonding *bond = netdev_priv(bond_dev); 4226 struct list_head *iter; 4227 struct slave *slave; 4228 struct bond_up_slave *arr; 4229 4230 bond_netpoll_cleanup(bond_dev); 4231 4232 /* Release the bonded slaves */ 4233 bond_for_each_slave(bond, slave, iter) 4234 __bond_release_one(bond_dev, slave->dev, true); 4235 netdev_info(bond_dev, "Released all slaves\n"); 4236 4237 arr = rtnl_dereference(bond->slave_arr); 4238 if (arr) { 4239 RCU_INIT_POINTER(bond->slave_arr, NULL); 4240 kfree_rcu(arr, rcu); 4241 } 4242 4243 list_del(&bond->bond_list); 4244 4245 bond_debug_unregister(bond); 4246 } 4247 4248 /*------------------------- Module initialization ---------------------------*/ 4249 4250 static int bond_check_params(struct bond_params *params) 4251 { 4252 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 4253 struct bond_opt_value newval; 4254 const struct bond_opt_value *valptr; 4255 int arp_all_targets_value; 4256 u16 ad_actor_sys_prio = 0; 4257 u16 ad_user_port_key = 0; 4258 4259 /* Convert string parameters. */ 4260 if (mode) { 4261 bond_opt_initstr(&newval, mode); 4262 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 4263 if (!valptr) { 4264 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 4265 return -EINVAL; 4266 } 4267 bond_mode = valptr->value; 4268 } 4269 4270 if (xmit_hash_policy) { 4271 if ((bond_mode != BOND_MODE_XOR) && 4272 (bond_mode != BOND_MODE_8023AD) && 4273 (bond_mode != BOND_MODE_TLB)) { 4274 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4275 bond_mode_name(bond_mode)); 4276 } else { 4277 bond_opt_initstr(&newval, xmit_hash_policy); 4278 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 4279 &newval); 4280 if (!valptr) { 4281 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4282 xmit_hash_policy); 4283 return -EINVAL; 4284 } 4285 xmit_hashtype = valptr->value; 4286 } 4287 } 4288 4289 if (lacp_rate) { 4290 if (bond_mode != BOND_MODE_8023AD) { 4291 pr_info("lacp_rate param is irrelevant in mode %s\n", 4292 bond_mode_name(bond_mode)); 4293 } else { 4294 bond_opt_initstr(&newval, lacp_rate); 4295 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 4296 &newval); 4297 if (!valptr) { 4298 pr_err("Error: Invalid lacp rate \"%s\"\n", 4299 lacp_rate); 4300 return -EINVAL; 4301 } 4302 lacp_fast = valptr->value; 4303 } 4304 } 4305 4306 if (ad_select) { 4307 bond_opt_initstr(&newval, ad_select); 4308 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 4309 &newval); 4310 if (!valptr) { 4311 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 4312 return -EINVAL; 4313 } 4314 params->ad_select = valptr->value; 4315 if (bond_mode != BOND_MODE_8023AD) 4316 pr_warn("ad_select param only affects 802.3ad mode\n"); 4317 } else { 4318 params->ad_select = BOND_AD_STABLE; 4319 } 4320 4321 if (max_bonds < 0) { 4322 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4323 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4324 max_bonds = BOND_DEFAULT_MAX_BONDS; 4325 } 4326 4327 if (miimon < 0) { 4328 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4329 miimon, INT_MAX); 4330 miimon = 0; 4331 } 4332 4333 if (updelay < 0) { 4334 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4335 updelay, INT_MAX); 4336 updelay = 0; 4337 } 4338 4339 if (downdelay < 0) { 4340 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4341 downdelay, INT_MAX); 4342 downdelay = 0; 4343 } 4344 4345 if ((use_carrier != 0) && (use_carrier != 1)) { 4346 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4347 use_carrier); 4348 use_carrier = 1; 4349 } 4350 4351 if (num_peer_notif < 0 || num_peer_notif > 255) { 4352 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4353 num_peer_notif); 4354 num_peer_notif = 1; 4355 } 4356 4357 /* reset values for 802.3ad/TLB/ALB */ 4358 if (!bond_mode_uses_arp(bond_mode)) { 4359 if (!miimon) { 4360 pr_warn("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n"); 4361 pr_warn("Forcing miimon to 100msec\n"); 4362 miimon = BOND_DEFAULT_MIIMON; 4363 } 4364 } 4365 4366 if (tx_queues < 1 || tx_queues > 255) { 4367 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 4368 tx_queues, BOND_DEFAULT_TX_QUEUES); 4369 tx_queues = BOND_DEFAULT_TX_QUEUES; 4370 } 4371 4372 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4373 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 4374 all_slaves_active); 4375 all_slaves_active = 0; 4376 } 4377 4378 if (resend_igmp < 0 || resend_igmp > 255) { 4379 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 4380 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4381 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4382 } 4383 4384 bond_opt_initval(&newval, packets_per_slave); 4385 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 4386 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 4387 packets_per_slave, USHRT_MAX); 4388 packets_per_slave = 1; 4389 } 4390 4391 if (bond_mode == BOND_MODE_ALB) { 4392 pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n", 4393 updelay); 4394 } 4395 4396 if (!miimon) { 4397 if (updelay || downdelay) { 4398 /* just warn the user the up/down delay will have 4399 * no effect since miimon is zero... 4400 */ 4401 pr_warn("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n", 4402 updelay, downdelay); 4403 } 4404 } else { 4405 /* don't allow arp monitoring */ 4406 if (arp_interval) { 4407 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4408 miimon, arp_interval); 4409 arp_interval = 0; 4410 } 4411 4412 if ((updelay % miimon) != 0) { 4413 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4414 updelay, miimon, (updelay / miimon) * miimon); 4415 } 4416 4417 updelay /= miimon; 4418 4419 if ((downdelay % miimon) != 0) { 4420 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4421 downdelay, miimon, 4422 (downdelay / miimon) * miimon); 4423 } 4424 4425 downdelay /= miimon; 4426 } 4427 4428 if (arp_interval < 0) { 4429 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4430 arp_interval, INT_MAX); 4431 arp_interval = 0; 4432 } 4433 4434 for (arp_ip_count = 0, i = 0; 4435 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 4436 __be32 ip; 4437 4438 /* not a complete check, but good enough to catch mistakes */ 4439 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 4440 !bond_is_ip_target_ok(ip)) { 4441 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4442 arp_ip_target[i]); 4443 arp_interval = 0; 4444 } else { 4445 if (bond_get_targets_ip(arp_target, ip) == -1) 4446 arp_target[arp_ip_count++] = ip; 4447 else 4448 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 4449 &ip); 4450 } 4451 } 4452 4453 if (arp_interval && !arp_ip_count) { 4454 /* don't allow arping if no arp_ip_target given... */ 4455 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4456 arp_interval); 4457 arp_interval = 0; 4458 } 4459 4460 if (arp_validate) { 4461 if (!arp_interval) { 4462 pr_err("arp_validate requires arp_interval\n"); 4463 return -EINVAL; 4464 } 4465 4466 bond_opt_initstr(&newval, arp_validate); 4467 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 4468 &newval); 4469 if (!valptr) { 4470 pr_err("Error: invalid arp_validate \"%s\"\n", 4471 arp_validate); 4472 return -EINVAL; 4473 } 4474 arp_validate_value = valptr->value; 4475 } else { 4476 arp_validate_value = 0; 4477 } 4478 4479 arp_all_targets_value = 0; 4480 if (arp_all_targets) { 4481 bond_opt_initstr(&newval, arp_all_targets); 4482 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 4483 &newval); 4484 if (!valptr) { 4485 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 4486 arp_all_targets); 4487 arp_all_targets_value = 0; 4488 } else { 4489 arp_all_targets_value = valptr->value; 4490 } 4491 } 4492 4493 if (miimon) { 4494 pr_info("MII link monitoring set to %d ms\n", miimon); 4495 } else if (arp_interval) { 4496 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 4497 arp_validate_value); 4498 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4499 arp_interval, valptr->string, arp_ip_count); 4500 4501 for (i = 0; i < arp_ip_count; i++) 4502 pr_cont(" %s", arp_ip_target[i]); 4503 4504 pr_cont("\n"); 4505 4506 } else if (max_bonds) { 4507 /* miimon and arp_interval not set, we need one so things 4508 * work as expected, see bonding.txt for details 4509 */ 4510 pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details\n"); 4511 } 4512 4513 if (primary && !bond_mode_uses_primary(bond_mode)) { 4514 /* currently, using a primary only makes sense 4515 * in active backup, TLB or ALB modes 4516 */ 4517 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 4518 primary, bond_mode_name(bond_mode)); 4519 primary = NULL; 4520 } 4521 4522 if (primary && primary_reselect) { 4523 bond_opt_initstr(&newval, primary_reselect); 4524 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 4525 &newval); 4526 if (!valptr) { 4527 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4528 primary_reselect); 4529 return -EINVAL; 4530 } 4531 primary_reselect_value = valptr->value; 4532 } else { 4533 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4534 } 4535 4536 if (fail_over_mac) { 4537 bond_opt_initstr(&newval, fail_over_mac); 4538 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 4539 &newval); 4540 if (!valptr) { 4541 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4542 fail_over_mac); 4543 return -EINVAL; 4544 } 4545 fail_over_mac_value = valptr->value; 4546 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4547 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 4548 } else { 4549 fail_over_mac_value = BOND_FOM_NONE; 4550 } 4551 4552 bond_opt_initstr(&newval, "default"); 4553 valptr = bond_opt_parse( 4554 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 4555 &newval); 4556 if (!valptr) { 4557 pr_err("Error: No ad_actor_sys_prio default value"); 4558 return -EINVAL; 4559 } 4560 ad_actor_sys_prio = valptr->value; 4561 4562 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 4563 &newval); 4564 if (!valptr) { 4565 pr_err("Error: No ad_user_port_key default value"); 4566 return -EINVAL; 4567 } 4568 ad_user_port_key = valptr->value; 4569 4570 if (lp_interval == 0) { 4571 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 4572 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 4573 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 4574 } 4575 4576 /* fill params struct with the proper values */ 4577 params->mode = bond_mode; 4578 params->xmit_policy = xmit_hashtype; 4579 params->miimon = miimon; 4580 params->num_peer_notif = num_peer_notif; 4581 params->arp_interval = arp_interval; 4582 params->arp_validate = arp_validate_value; 4583 params->arp_all_targets = arp_all_targets_value; 4584 params->updelay = updelay; 4585 params->downdelay = downdelay; 4586 params->use_carrier = use_carrier; 4587 params->lacp_fast = lacp_fast; 4588 params->primary[0] = 0; 4589 params->primary_reselect = primary_reselect_value; 4590 params->fail_over_mac = fail_over_mac_value; 4591 params->tx_queues = tx_queues; 4592 params->all_slaves_active = all_slaves_active; 4593 params->resend_igmp = resend_igmp; 4594 params->min_links = min_links; 4595 params->lp_interval = lp_interval; 4596 params->packets_per_slave = packets_per_slave; 4597 params->tlb_dynamic_lb = 1; /* Default value */ 4598 params->ad_actor_sys_prio = ad_actor_sys_prio; 4599 eth_zero_addr(params->ad_actor_system); 4600 params->ad_user_port_key = ad_user_port_key; 4601 if (packets_per_slave > 0) { 4602 params->reciprocal_packets_per_slave = 4603 reciprocal_value(packets_per_slave); 4604 } else { 4605 /* reciprocal_packets_per_slave is unused if 4606 * packets_per_slave is 0 or 1, just initialize it 4607 */ 4608 params->reciprocal_packets_per_slave = 4609 (struct reciprocal_value) { 0 }; 4610 } 4611 4612 if (primary) { 4613 strncpy(params->primary, primary, IFNAMSIZ); 4614 params->primary[IFNAMSIZ - 1] = 0; 4615 } 4616 4617 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4618 4619 return 0; 4620 } 4621 4622 /* Called from registration process */ 4623 static int bond_init(struct net_device *bond_dev) 4624 { 4625 struct bonding *bond = netdev_priv(bond_dev); 4626 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4627 4628 netdev_dbg(bond_dev, "Begin bond_init\n"); 4629 4630 bond->wq = create_singlethread_workqueue(bond_dev->name); 4631 if (!bond->wq) 4632 return -ENOMEM; 4633 4634 netdev_lockdep_set_classes(bond_dev); 4635 4636 list_add_tail(&bond->bond_list, &bn->dev_list); 4637 4638 bond_prepare_sysfs_group(bond); 4639 4640 bond_debug_register(bond); 4641 4642 /* Ensure valid dev_addr */ 4643 if (is_zero_ether_addr(bond_dev->dev_addr) && 4644 bond_dev->addr_assign_type == NET_ADDR_PERM) 4645 eth_hw_addr_random(bond_dev); 4646 4647 return 0; 4648 } 4649 4650 unsigned int bond_get_num_tx_queues(void) 4651 { 4652 return tx_queues; 4653 } 4654 4655 /* Create a new bond based on the specified name and bonding parameters. 4656 * If name is NULL, obtain a suitable "bond%d" name for us. 4657 * Caller must NOT hold rtnl_lock; we need to release it here before we 4658 * set up our sysfs entries. 4659 */ 4660 int bond_create(struct net *net, const char *name) 4661 { 4662 struct net_device *bond_dev; 4663 struct bonding *bond; 4664 struct alb_bond_info *bond_info; 4665 int res; 4666 4667 rtnl_lock(); 4668 4669 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4670 name ? name : "bond%d", NET_NAME_UNKNOWN, 4671 bond_setup, tx_queues); 4672 if (!bond_dev) { 4673 pr_err("%s: eek! can't alloc netdev!\n", name); 4674 rtnl_unlock(); 4675 return -ENOMEM; 4676 } 4677 4678 /* 4679 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX. 4680 * It is set to 0 by default which is wrong. 4681 */ 4682 bond = netdev_priv(bond_dev); 4683 bond_info = &(BOND_ALB_INFO(bond)); 4684 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; 4685 4686 dev_net_set(bond_dev, net); 4687 bond_dev->rtnl_link_ops = &bond_link_ops; 4688 4689 res = register_netdevice(bond_dev); 4690 4691 netif_carrier_off(bond_dev); 4692 4693 rtnl_unlock(); 4694 if (res < 0) 4695 bond_destructor(bond_dev); 4696 return res; 4697 } 4698 4699 static int __net_init bond_net_init(struct net *net) 4700 { 4701 struct bond_net *bn = net_generic(net, bond_net_id); 4702 4703 bn->net = net; 4704 INIT_LIST_HEAD(&bn->dev_list); 4705 4706 bond_create_proc_dir(bn); 4707 bond_create_sysfs(bn); 4708 4709 return 0; 4710 } 4711 4712 static void __net_exit bond_net_exit(struct net *net) 4713 { 4714 struct bond_net *bn = net_generic(net, bond_net_id); 4715 struct bonding *bond, *tmp_bond; 4716 LIST_HEAD(list); 4717 4718 bond_destroy_sysfs(bn); 4719 4720 /* Kill off any bonds created after unregistering bond rtnl ops */ 4721 rtnl_lock(); 4722 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 4723 unregister_netdevice_queue(bond->dev, &list); 4724 unregister_netdevice_many(&list); 4725 rtnl_unlock(); 4726 4727 bond_destroy_proc_dir(bn); 4728 } 4729 4730 static struct pernet_operations bond_net_ops = { 4731 .init = bond_net_init, 4732 .exit = bond_net_exit, 4733 .id = &bond_net_id, 4734 .size = sizeof(struct bond_net), 4735 }; 4736 4737 static int __init bonding_init(void) 4738 { 4739 int i; 4740 int res; 4741 4742 pr_info("%s", bond_version); 4743 4744 res = bond_check_params(&bonding_defaults); 4745 if (res) 4746 goto out; 4747 4748 res = register_pernet_subsys(&bond_net_ops); 4749 if (res) 4750 goto out; 4751 4752 res = bond_netlink_init(); 4753 if (res) 4754 goto err_link; 4755 4756 bond_create_debugfs(); 4757 4758 for (i = 0; i < max_bonds; i++) { 4759 res = bond_create(&init_net, NULL); 4760 if (res) 4761 goto err; 4762 } 4763 4764 register_netdevice_notifier(&bond_netdev_notifier); 4765 out: 4766 return res; 4767 err: 4768 bond_destroy_debugfs(); 4769 bond_netlink_fini(); 4770 err_link: 4771 unregister_pernet_subsys(&bond_net_ops); 4772 goto out; 4773 4774 } 4775 4776 static void __exit bonding_exit(void) 4777 { 4778 unregister_netdevice_notifier(&bond_netdev_notifier); 4779 4780 bond_destroy_debugfs(); 4781 4782 bond_netlink_fini(); 4783 unregister_pernet_subsys(&bond_net_ops); 4784 4785 #ifdef CONFIG_NET_POLL_CONTROLLER 4786 /* Make sure we don't have an imbalance on our netpoll blocking */ 4787 WARN_ON(atomic_read(&netpoll_block_tx)); 4788 #endif 4789 } 4790 4791 module_init(bonding_init); 4792 module_exit(bonding_exit); 4793 MODULE_LICENSE("GPL"); 4794 MODULE_VERSION(DRV_VERSION); 4795 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 4796 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 4797